Why do SQL Server table names add square brackets?

This is not required, but if the table name or field name references a keyword in SQL Server, the database does not recognize whether this is a keyword or a table name (or field name) that must be added.

For example, a table named User,user is a keyword in SQL Server, so you have to do this when querying:

SELECT * FROM [user]

Otherwise you will get an error.

Similarly, if the user belongs to a field name, it is also added, as

SELECT * from table name WHERE [user]=1

Why do SQL Server table names add square brackets?