Camera Movements -- What is it & How is it used ?

Zoom 

What is it ? Zoom is the act of moving the lens of a camera in & out.

How is it used ? It is used to change the shot smoothly from a long shot to a close-up shot or vice versa (Google define).

Pan

What is it ? Panning is when one moves the camera right or left in a shot.

How is it used ? This style of camera movement is used to give a panoramic effect or to follow a subject (Google define).

Tilt

What is it ? Tilting is when the camera is moved (whilst filming) to face up or down.

How is it used ? Tilting is used to film in a vertical plane. (Google define).

Dolly

What is it ? A dolly is used to move the camera forward or backwards. This differs from the zoom movement in that zooming moves in closer to an already predetermined shot. A dolly, on the other hand, manually the moves the camera in order to do so.

How is it used ? A dolly is used to move a shot onto a mobile platform in a specified direction (Google define).