Blender , many times creates another file called blender1, why ?

many times i see when i save a file that it creates another one with the same name but with the extension .blender1

do you know why ?

In the poto , the ones are marked in green

Autosave files see:

Blender likes to automatically make backups of your blend files- I think if you take the 1 off the end of the file you’ll get a regular blend file that you can use…