What is "choke point"

In military strategy, a choke point (or chokepoint) is a geographical feature on land such as a valley, defile or a bridge or at sea such as a strait, which an armed force is forced to pass, sometimes on a substantially narrower front and therefore greatly decreasing its combat power, to reach its objective. A choke point can allow a numerically inferior defending force to thwart a larger opponent if the attacker cannot bring superior numbers to bear.