ETL tools are software applications designed to facilitate the process of Extracting, Transforming, and Loading data. They help organizations gather data from various sources, such as databases and spreadsheets, and convert it into a usable format. This process is essential for data analysis, reporting, and business intelligence. These tools streamline data integration by automating the workflow, ensuring that data is accurate and consistent. Popular ETL tools include Informatica, Talend, and Apache Nifi. By using ETL tools, businesses can make informed decisions based on reliable data insights.