What's the difference between endpoint and socket?

Question

Almost every definition of socket that I've seen, relates it very closely to the term endpoint:

wikipedia:

A network socket is an internal endpoint for sending or receiving data at a single node in a computer network. Concretely, it is a representation of this endpoint in networking software

This answer:

a socket is an endpoint in a (bidirectional) communication

Oracle's definition:

A socket is one endpoint of a two-way communication link between two programs running on the network

Even stackoverflow's definition of the tag 'sockets' is:

An endpoint of a bidirectional inter-process communication flow

This other answer goes a bit further:

A TCP socket is an endpoint instance

Although I don't understand what "instance" means in this case. If an endpoint is, according to this answer, a URL, I don't see how that can be instantiated.

Answer 1

"Endpoint" is a general term, including pipes, interfaces, nodes and such, while "socket" is a specific term in networking.