Vim installs YouCompleteMe. what does this mean?

  question, vim

图片描述

When I went to the root directory to execute. /install.sh, this problem occurred. it took a long time to run after execution, and a lot of other things were installed. is this necessary?

This YCM is used to complete C/C++/C# code. If you don’t write these, you don’t need to install them.