From which source are you getting these files?
💡 Model Answer
Files can come from a variety of sources depending on the system architecture. Common sources include relational databases (e.g., MySQL, PostgreSQL) where data is exported as CSV or JSON, APIs that provide data in JSON or XML, cloud storage services like Amazon S3, Azure Blob Storage, or Google Cloud Storage, and on-premises file systems accessed via FTP or SMB. In an ETL pipeline, the extraction step typically connects to one or more of these sources, pulls the data, and writes it to a staging area for further processing. For example, a data engineer might use a JDBC connector to pull records from a database, or use the AWS SDK to download a CSV file from S3, then load it into a data lake.
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