c# - What is the difference between IEqualityComparer<T> and IEquatable<T>?

Question

I want to understand the scenarios where IEqualityComparer<T> and IEquatable<T> should be used. The MSDN documentation for both looks very similar.

Answer 1

IEqualityComparer<T> is an interface for an object that performs the comparison on two objects of the type T.

IEquatable<T> is for an object of type T so that it can compare itself to another of the same type.