Here's why:

* Speed is a measure of how fast an object is moving. It's typically calculated as distance traveled over a period of time.

* Instantaneous speed refers to the speed of an object at a specific point in time. It's like taking a snapshot of the object's speed at that precise moment.

For example, imagine a car traveling down the road. Its average speed might be 60 miles per hour. However, at a specific moment, the car might be going 65 miles per hour as it accelerates to pass another vehicle. That 65 miles per hour is the instantaneous speed at that particular moment.

Let me know if you have any other questions!