Okay, so imagine you're riding your bike, and you're pedaling really fast. That's called your cadence! It's how many times your bike pedals go around in one minute.
Cadence is important for a few reasons. First, pedaling faster can help you go faster and for longer distances. Second, it can help you use your muscles more efficiently so you don't get tired as quickly.
Now, let's say you're riding up a big hill. To make it up the hill easier, you might want to pedal slower and put more force into each pedal. This will make your cadence slower, but that's okay because it'll help you get up the hill without getting too tired.
On the other hand, if you're riding on a flat road or going downhill, you might want to pedal faster and use less force with each pedal. This will make your cadence faster, and it'll help you go faster without getting too tired.
So basically, cadence is all about finding the right speed for your pedals depending on how hard you need to work and how far you want to go. It's like finding the right gear for your bike!