Final answer:
The message instructs a user to handle uncommitted changes in files before switching branches in a version control system like git, to avoid losing any work.
Step-by-step explanation:
The message "please move or remove them before you switch branches" typically appears in the context of version control systems like git. When you have made changes to files that are not yet committed, and you attempt to switch to a different branch, the version control system warns you to either commit the changes, stash them, or discard them before switching branches. This is to prevent losing the uncommitted changes since different branches might have divergent versions of the files in question.