The magnitude of a vector is its size, and the direction of a vector is the way it is pointing.
In physics, a vector is often used to represent a force. A force is a push or pull that can cause an object to change its motion. The magnitude of a force is its strength, and the direction of a force is the way it is acting on the object.
The vector representation of force is a line with an arrow at one end. The length of the line represents the magnitude of the force, and the direction of the arrow represents the direction of the force.