Can you explain what is meant by Data Source in the context of working with data and systems?

Data Source — is a source of data from which a system or application receives information for processing or display. In the context of data work, this can be a database, API, file, data stream, or any other mechanism that provides data. For example, in an application displaying a list of users, the Data Source could be a server that returns JSON with user data.

In programming, Data Source is often implemented as an abstraction that allows separating the logic of data retrieval from its usage, which facilitates support and testing of the code.