The jumplist works across files
The great thing about the jumplist is that it works across files. If you’re a programmer, this is really useful if you’re using some kind of jump-to-definition plugin — you can jump, then return back using <C-o>.
Let’s try it in the editor. Jump around in the file again, and when you’re done open up the other.txt file with :e other.txt. Jump around in there too. Once you’ve had enough, use <C-o> and <C-i> as before to traverse the jumplist. You’ll notice that the jumplist works across files!