Explain the importance of a Rendezvous point?

Rendezvous point is normally inserted in between the vuser scripts to emulate the heavy/peak loads on the servers. This is achieved by gathering vusers to wait until some time and release all at a time to put load on the server all at once. For example stop all your users up to certain time until they are 200 in count and then release all at a time so that every one logs in the same time to give more load on the server.