Among the project version control tools, svn uses a centralized development mode, git uses a distributed development mode, the core of centralized code management is the server, and all developers must obtain code from the server before starting a new day's work , then develop, and finally resolve conflicts, commit. All version information is placed on the server. If you are off the server, the developer can basically say that it is impossible to work. The biggest difference between distributed and centralized is that developers can commit locally. There is a server's database on each developer machine.