What is ETL
Extract, Transform, Load data
ETL (Extract, Transform, Load) is the process of extracting data from various sources, transforming it, and loading it into a target storage for analysis and reporting.
ETL Stages
- Extract — collecting data from databases, APIs, files
- Transform — cleaning, validation, aggregation
- Load — transferring to data warehouse or data lake
ETL Tools
- Apache Airflow — pipeline orchestration
- Talend — enterprise ETL platform
- dbt — transformation in warehouse
- Fivetran — automated integration
Business Applications
- Building data warehouses
- CRM, ERP, marketing integration
- Data preparation for BI reports
- System migration