What is the MERGE_MSG.swp file?

Question

When executing the command of merge of my branch in another. The following warning has occurred:

As per the image description itself. The alert is displayed because the file .MERGE_MSG.swp is also being edited by someone else or some file editing has caused conflict with the version of the file on my machine.

I will delete it from my machine to download the current version of master. But first I would like a definition about the file. What is its function and what is it for?

Answer 1

This is a temporary archive of vim. Here you have the documentation of this file type.