Methods returning/accepting IEnumerable [duplicate]

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Can anyone explain IEnumerable and IEnumerator to me?

what is IEnumerable in .net

I'm very confused on this IEnumerable thing.

What does it mean when method returns IEnumerable/IEnumerable<T> or when it's used as a parameter? My guess is that it can return/accept any (generic)collection type, which we can use later in foreach loops, no?

And what makes me even more confused is that it's an interface开发者_如何学编程.

Not sure what makes me so confused, but I really feel stupid about it.