The terms current source and sink, imply the direction of current flow.
For a source circuit, there is a "switch" connected between the positive terminal and load, where it sources the current through the load from a voltage supply.
For a sink circuit, there is a "switch" connected between the load and negative terminal, where the current sinks to ground through the load.
Is my understanding correct or not ?
What is the importance of understanding the source and sink concept in schematic design ?