What is Click ?
Click is (noun) 1. a short sharp sound She heard a click and saw the doorknob turn. 2. the act of pressing a key on a computer keyboard or a mouse button(verb) 1. to make a short sharp sound The cameras clicked as she came out of the church. He clicked his fingers to attract the waiter’s attention. 2. to become clear and easily understood suddenly everything clicked suddenly it all became clear 3. to quickly press the button on a mouse to start a computer function The pull-down menu is displayed by clicking on the menu bar at the top of the screen. Click twice to start the program.
source: Easier English, Student Dictionary Upper Intermediate Level