CSMA/CA stands for: Carrier Sense Multiple Access With Collision Avoidance. This is in a class of protocols called "multiple access methods" and is used for computer networking. Using CSMA, a station cannot transmit unless there is no other activity on the line. If it is determined that the line is busy, the station must wait until the line is clear. This process stops collisions from happening.
. For more information on csma ca visit http://www.freebase.com/view/en/csma_carp