Speed:

1. Speed is a scalar quantity, which means it has magnitude (numerical value) but no direction.
2. It represents how fast an object is moving, regardless of its direction.
3. The speed of an object is the total distance traveled by the object divided by the total time taken.
4. Speed is always positive or zero and is measured in units like meters per second (m/s) or kilometers per hour (km/h).

Velocity:

1. Velocity is a vector quantity, which means it has both magnitude (numerical value) and direction.
2. It represents how fast an object is moving and in which direction it is moving.
3. Velocity takes into account the displacement (change in position) of an object and the time taken to undergo that displacement.
4. Velocity can be positive or negative, depending on the direction of motion, and is measured in units like meters per second (m/s) or kilometers per hour (km/h).