What is the uses of car remote?

Depends on design you have, lock/unlock &panic mode are the base models. Remote start & rear hatch opening on some others

It is the most important feature of a car.It is increased your comfort level. http://replacemyremote.com/ is place where you can buy it in reasonable price.

Yo lock and unlock the car. To open the trunk. To set off an alarm.

Typicically uses are to lock and unlock a car or prime the alarm system.

Car remotes are for convenience. So you can lock/unlock the doors and trunk, set the alarm, locate the vehicle (via the panic button), even start the vehicle remotely.

car remote is also used remotely to lock and unlock doors