Any change in velocity during a given length of time is called acceleration.

Here's why:

* Velocity is a measure of speed and direction.

* Acceleration is the rate at which velocity changes.

This means that if an object's velocity is increasing, decreasing, or changing direction, it is experiencing acceleration.

Examples of acceleration:

* A car speeding up from a stop sign.

* A ball thrown upwards slowing down as it reaches its peak.

* A car turning a corner, even if it maintains its speed.

Let me know if you'd like to learn more about acceleration!