Lets say you need to put something to LIVE site fast. And you go and check what is currently in line to get pulled once you fire git pull (https://itportal.foreo.com/documentation/card/1011) and see there are other branches/commits coming and you are dont know is it LIVE material. There is a side route for this cases. You can cherrypick specific commits by their HASH id.
So you go to live git directory, make git fetch and then write
git cherry-pick 68213c9548a03c176484d18c8986c77dcadfe76c
where this ID is SHA-1 value for that commit. With this command you have just put this commit to LIVE site and made a hotfix that way. This only works for commits, merge commits wont work.