This is the end.
All is well that ends well, right?
Work ends this week and Christmas holidays starts next week! Aww I can't wait for that.
By now you should know that 終わる means "to end" or "to finish." So what is this noun-version of that word? It would be the end or the finish.
The reading comes from 終わる. So long as you know that word, you can learn this word's reading as well!