C - What interfaces are in the diagrams of the UML components

Question

What is a component diagram interface in C?

I am a built-in system tester that understands software development architecture. I saw diagrams of the project components that I execute when testing the Black Box. I have seen that components are represented by blocks that combine with "sockets" and "lellips". I know that these are interfaces, and components provide and request interfaces. I read various articles, but I did not find a practical example. Are they functions and variables, and the component requesting such an interface calls it, and the provider has a function definition?

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