SQL Server Knowledge _mssql

What is the difference between a SQL Server server and a server group

A server group is just a logical concept, similar to a group of colleagues, friends, and family members in a class or QQ. There are n students under the general class. Students are the equivalent of a server. Just for the convenience of the organization, when the server is too much, put in different groups for easy to find the server.

What is the difference between two ways of authenticating in SQL Server?

The abstract point is that you have to modify a thing.
System to verify what you are identity, the database is not random can be arbitrarily changed.
Windows authentication and SQL Server authentication means you have to show your credentials.
Windows authentication is the identification of the Windows account.
SQL Server Authentication is a set of authentication mechanisms for SQL Server itself.
Different identity logins, permissions are not the same.
For example, often said SA, is the administrator identity, the right than ordinary identity is relatively high.
SQL Sever is a system administrator, Windows is just a user,
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