Acceleration is the rate of change of velocity over time.

Here's a more detailed explanation:

* Velocity is a measure of how fast an object is moving and in what direction.

* Acceleration tells us how quickly the velocity of an object is changing.

Formula:

Acceleration (a) = (Change in Velocity (Δv)) / (Change in Time (Δt))

Units:

* Velocity is typically measured in meters per second (m/s).

* Time is measured in seconds (s).

* Therefore, acceleration is measured in meters per second squared (m/s²).

Examples:

* A car speeding up from 0 to 60 mph in 5 seconds is accelerating.

* A ball thrown upwards slows down as it travels against gravity; this is also acceleration (in this case, negative acceleration or deceleration).

Let me know if you'd like to explore any specific examples or aspects of acceleration further!