What is a "pluggable" API?

Question

I'm evaluating a piece of software (uPortal), and it lists one of its features as "Pluggable APIs."

I know what an API is, but have not heard the pluggable term before. What does it mean for an API to be "pluggable"?

Answer 1

It means that you can replace the implementation. Like a provider model, like ODBC database drivers - you can plug in drivers for various databases, using the same API.