What's the difference between IEnumerable and IEnumerator interfaces?

Question

.NET

From my approximate knowledge, the IEnumerator interface provides access to different elements from a particular collection, and the IEnumerable interface provides access to a class object that implements IEnumerator.
When do you need to use these interfaces separately and does it make sense to use both at once?

Answer 1

The entity being run over must implement IEnumerable.
The entity that runs must implement IEnumerator (usually a nested, often privately declared class).
What you said, I unfortunately did not understand.

Answer 2

Enumerable - enumerable, Enumerator - enumerator (from English), when you sleep, sheep is IEnumerable, and you who counts them - IEnumerator.