motion uses a video4linux device for detecting movement. It makes snapshots of the movement which can be converted to MPEG movies in realtime , making it usable as an observation or security system. It can take actions like sending out email and SMS messages when detecting motion.

Motion monitors the video signal from one or more cameras and is able to detect if a significant part of the picture has changed. Features: interval snapshots, live streaming webcam, mpeg generation, database interface, OSD etc.

The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary; -- opposed to rest.

Direction of movement; course; tendency; as, the motion of the planets is from west to east.

To make a significant movement or gesture, as with the hand; as, to motion to one to take a seat.

the use of movements (especially of the hands) to communicate familiar or prearranged signals

a change of position that does not entail a change of location; "the reflex motion of his eyebrows revealed his surprise"; "movement is a sign of life"; "an impatient move of his hand"; "gastrointestinal motility"

the act of changing location from one place to another; "police controlled the motion of the crowd"; "the movement of people from the farms to the cities"; "his move put him directly in my path"

show, express or direct through movement; "He gestured his desire to leave"

Movement of an object in relation to its surroundings.

Movement of the mouse.

Refers to the physical act of betting; the act of a player reaching for their chips and making a movement towards the pot to bet.

The ability or power of an object to move. Change of position. The forces that act on bodies determine their direction of movement.

(n) The movement of a part, either linearly or angularly, over time and space.