Why is CSMA/CA needed in a wireless network?

What will be an ideal response?

In wireless networks there is a hidden terminal/station problem, where some stations may
not see/detect the transmission between some other parties. To ensure that all stations share the
transmission media correctly, wireless LANs use a modified access protocol known as Carrier Sense
Multiple Access With Collision Avoidance (CSMA/CA). Instead of depending on all other computers to
receive all transmissions, the CSMA/CA used with wireless LANs triggers a brief transmission from the
intended receiver before transmitting a packet. The idea is that if both the sender and receiver
transmit a message, all computers within range of either will know a packet transmission is
beginning.