"Git Log" command in Powershell - unable to terminate process
It puts you in a pager (most probably less if you installed MSysGit or Github for Windows), because the output you requested is longer than one screen page.
You can scroll up/down/left/right with your arrow keys, the Page Up/Page Down keys and the J/K/H/L keys.
To show inline help, press ? and to quit, press Q.
You can use a different pager or turn it off if you want to. As man git config points out, you can use the core.pager setting to set it to a different pager, or set its value to cat to disable pagination for all Git commands.
If the pager is killed using Ctrl-C then the pager keeps running in the background and on each newline in terminal it will print a line and (END). So far I have not found a way of saving such a terminal. When I exit the terminal, the pager still keeps it alive until I kill the window.
q works to exit the pager / less-command if Ctrl-C has not been used.