* Velocity is a vector quantity. This means it has both magnitude (speed) and direction.

* Velocity describes the rate of change of an object's position. It tells us how fast an object is moving and in what direction.

* A change in velocity can be caused by a change in speed, a change in direction, or both. For example, a car turning a corner at constant speed still experiences a change in velocity.

* Constant velocity means an object is moving at a constant speed in a straight line.

* Velocity can be positive or negative. The sign usually indicates direction relative to a chosen coordinate system. For example, moving to the right could be positive velocity, and moving to the left could be negative velocity.

* The unit of velocity is distance over time. Common units include meters per second (m/s), kilometers per hour (km/h), or miles per hour (mph).

Let me know if you'd like to dive into specific examples or scenarios involving velocity!