Difference between a User and a Login in SQL Server

I have recently been running into many different areas of SQL Server that I normally don’t mess with. One of them that has me confused is the area of Logins and Users. Seems like it should be a pretty simple topic…

It appears that each login can only have 1 user and each user can only have 1 login.

A login can be associated to multiple tables thus associating that user to many tables.

So my question is why even have a login and a user? they seem to be pretty much one in the same. What are the differences, or what is it that I seem to be missing?

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