-> Fail: If session CAN'T be establised, it sends back an error and the process goes no further
-> Success: If session CAN be established then
session layer will maintain the established connection,

It also co-operate with session layer of remote computer in order ==to synchronise communications.==

As each session it creates is unique to the communication in question.
This allows you to make multiple requests to different endpoints simultaneously without all the data getting mixed up (think about opening two tabs in a web browser at the same time)!