A source is a system that you want to load data from and synchronize it into another system. A source can be a 3rd party API, SaaS, database, data warehouse, or a data lake.
Mage uses the data engineering community standard for data integrations called the Singer spec.
In addition, Mage further standardizes the spec and provides common classes and methods to make implementing them easier and faster.
Destinations are defined in the mage_integrations/destinations/ directory.
All destinations should be a subclass of the Destination class defined in
mage_integrations/destinations/base.py.