{"id":168759,"date":"2026-01-28T12:34:22","date_gmt":"2026-01-28T11:34:22","guid":{"rendered":"https:\/\/liora.io\/en\/?p=168759"},"modified":"2026-02-06T07:31:53","modified_gmt":"2026-02-06T06:31:53","slug":"etl-or-extract-transform-load-definition-and-use","status":"publish","type":"post","link":"https:\/\/liora.io\/en\/etl-or-extract-transform-load-definition-and-use","title":{"rendered":"ETL or Extract Transform Load: Definition and use"},"content":{"rendered":"<style><br \/>\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style>\n<p><strong>With the advent of Big Data, companies are collecting more and more data. Over the past few years, the democratization of ETL software has enabled them to extract, transform and load this data into their data warehouses for better analysis. Let&#8217;s take a look at how this software works and at the different players on the market.<\/strong><\/p>\n<h2 class=\"wp-block-heading\" id=\"h-what-is-etl\">What is ETL ?<\/h2>\nETL processes first appeared in the 1970s. At that time, companies began to collect data from a variety of sources. ETL software was born to meet the need to integrate this diverse data.&nbsp;\n\nBehind this acronym lie three essential steps in data management and business intelligence: <b>Extract-Transform-Load<\/b>, i.e. extracting data from the enterprise, transforming it, and loading it onto <b>data warehouses<\/b>. At the end of the process, ETL software must have been able to produce clean, easily accessible data that can be effectively exploited by analytics, business intelligence, and the company&#8217;s <b>various business functions<\/b>.\n<h2 class=\"wp-block-heading\" id=\"h-first-step-data-extraction\">First step: data extraction<\/h2>\nThe first step in the ETL process is to extract raw data that has been collected by the company and may come from a variety of data sources: existing <a href=\"https:\/\/liora.io\/en\/database-what-is-it\">databases<\/a>, logs concerning the company&#8217;s activity, <b>unstructured databases<\/b> relating to the behavior, performance, and anomalies of applications or other various operations. <b>Data extraction<\/b> enables data to be consolidated, processed, and refined, then stored in a centralized location before transformation.&nbsp;\n<h2 class=\"wp-block-heading\" id=\"h-second-step-data-transformation\">Second step: data transformation<\/h2>\nOnce the data has been extracted, the second step is to <b>refine it<\/b>. During this transformation phase, the data is sorted, structured, and cleaned: duplicate data is removed, missing values are eliminated, and all data is checked for consistency, usability, and reliability.\n<h2 class=\"wp-block-heading\" id=\"h-third-step-data-loading\">Third step: data loading<\/h2>\nData loading, or &#8216;Load&#8217; as it is known in the Extract Transform Load process, simply means moving the sorted and cleansed data to a new storage space, the <a href=\"https:\/\/liora.io\/en\/data-warehouse-2\">data warehouse<\/a>, where it can be <b>accessed<\/b> and <b>analyzed <\/b>by all the company&#8217;s departments. In general, data warehouses support two modes of data loading:<b> full loading<\/b> and<b> incremental loading<\/b>. The latter will only take into account data that is different from that already present in the storage space.\n\n<style><br \/>\n.elementor-widget-image{text-align:center}.elementor-widget-image a{display:inline-block}.elementor-widget-image a img[src$=\".svg\"]{width:48px}.elementor-widget-image img{vertical-align:middle;display:inline-block}<\/style>\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"469\" src=\"https:\/\/liora.io\/app\/uploads\/sites\/9\/2023\/06\/ETL2.jpg\" alt=\"ETL2\" loading=\"lazy\" srcset=\"https:\/\/liora.io\/app\/uploads\/sites\/9\/2023\/06\/ETL2.jpg 1024w, https:\/\/liora.io\/app\/uploads\/sites\/9\/2023\/06\/ETL2-300x176.jpg 300w, https:\/\/liora.io\/app\/uploads\/sites\/9\/2023\/06\/ETL2-768x450.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\">\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex is-content-justification-center\"><div class=\"wp-block-button \"><a class=\"wp-block-button__link wp-element-button \" href=\"\/en\/courses\/data-ai\/\">Know more about our Data Science courses<\/a><\/div><\/div>\n\n<h2 class=\"wp-block-heading\" id=\"h-the-benefits-of-etl-software\">The benefits of ETL software<\/h2>\nAll the steps in an ETL process can, of course, be carried out manually, but the margins for error are particularly wide. In the age of <a href=\"https:\/\/liora.io\/en\/big-data-definition-technologies-uses-and-training\">Big Data<\/a>, companies are collecting ever more data, and for many, manual processing would require the mobilization of a <b>large number of employees<\/b>. An automated process enables better control of data, greater agility thanks to the centralization of the <b>ETL process<\/b> within a single software package, better sharing with the company&#8217;s various departments, and greater accuracy.\n<h2 class=\"wp-block-heading\" id=\"h-who-are-the-main-players-in-the-etl-market\">Who are the main players in the ETL market?<\/h2>\nThere are several proprietary and open-source solutions in the ETL software market. Among the best-known are BIRT, Cloudera, Pentaho, and Talend.\n\n<a href=\"https:\/\/open-source-guide.com\/Solutions\/Applications\/Decisionnel-reporting\/Birt\">Birt<\/a>, which stands for Business Intelligence Reporting Tools, lets you create<a href=\"https:\/\/liora.io\/en\/dataviz-definition-objectives-and-uses\"> data visualizations and dashboards<\/a>, which you can insert directly into your web platforms and customer reports. It&#8217;s an open-source solution, which means you can use its code to insert its modules into many other applications.&nbsp;\n\n<a href=\"\/\">Cloudera<\/a>, a <b>second ETL solution<\/b>, offers multi-functional analysis on a unified platform, eliminating silos and enabling more efficient data analysis.&nbsp; In its <b>data-sharing process<\/b>, Cloudera focuses on security, data governance, and the production of consistent metadata. Flexible, it enables data to be deployed on a public cloud, a multi-cloud, and directly on-site.\n\nPreviously known as Kettle, <a href=\"https:\/\/open-source-guide.com\/Solutions\/Developpement-et-couches-intermediaires\/Etl\/Pentaho-data-integration\">Pentaho is an Open Source<\/a> software package that enables the design and execution of highly complex <b>data manipulation<\/b> and <b>transformation operations<\/b>. Pentaho is available in a free version, but the paid version offers far more functionality.&nbsp;\n\nLast but not least, <a href=\"https:\/\/www.talend.com\/fr\/\">French company Talend<\/a> is another major player in the market. It is the publisher of an Open Source software suite that has been around since 2005. Its <b>ETL software<\/b> is known as Talend Open Studio for Data Integration (TOS). This software enables <b>data flow to be created<\/b> intuitively, using a graphical interface. This integration solution is particularly appreciated for its ease of use, flexibility, and scalability.<b> Talend&#8217;s software<\/b> suite offers a range of tools for collecting, qualifying, processing, centralizing, and rendering your data.\n\nThere are many solutions for extracting, transforming, and loading your data. ETL software, whether free or paid for, is generally designed to <b>facilitate <\/b>and <b>secure data management<\/b> and <b>analysis<\/b>. Given the evolution of corporate data collection, it&#8217;s a safe bet that the ETL market will<b> continue to grow<\/b> and that their functionalities will continue to evolve.\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex is-content-justification-center\"><div class=\"wp-block-button \"><a class=\"wp-block-button__link wp-element-button \" href=\"\/en\/courses\/data-ai\/\">Know more about our Data Science courses<\/a><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>With the advent of Big Data, companies are collecting more and more data. Over the past few years, the democratization of ETL software has enabled them to extract, transform and load this data into their data warehouses for better analysis. Let\u2019s take a look at how this software works and at the different players on the market.<\/p>\n","protected":false},"author":85,"featured_media":168760,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"_acf_changed":false,"editor_notices":[],"footnotes":""},"categories":[2433],"class_list":["post-168759","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-ai"],"acf":[],"_links":{"self":[{"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/posts\/168759","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/users\/85"}],"replies":[{"embeddable":true,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/comments?post=168759"}],"version-history":[{"count":3,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/posts\/168759\/revisions"}],"predecessor-version":[{"id":205395,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/posts\/168759\/revisions\/205395"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/media\/168760"}],"wp:attachment":[{"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/media?parent=168759"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/liora.io\/en\/wp-json\/wp\/v2\/categories?post=168759"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}