A motion is a topic or subject proposed as a basis of discussion. Since a member at a meeting formally introduces or moves a subject for discussion it is called a motion. With the permission of the chairman a motion is moved by an individual. He ‘secures the floor’, addresses the chairman and makes a short speech in support of the motion.
Immediately after that another member stands up and ‘seconds’ it. A motion when seconded is called a proposal and it is before the meeting. If no one seconds a motion, it ‘falls to the ground’ and no discussion takes place on it. A formal motion like ‘point of order’ or a motion by the chairman does not require seconding.