What's chokepoint?

I’m sorry my ignorance, but what is chokepoint? I always heard some saying that. Dont laugh of me…

It’s where a base path is designed to slow down troops/king

https://en.wikipedia.org/wiki/Choke_point

 

example

http://royal-revolt-2.wikia.com/wiki/Base_Designs:_Staircase_of_Death