Finger-counting is a way of using our hands and fingers to help us count things. You can use your fingers to help you remember how many of something there are.
Here's an example: let's say you have three apples. You can hold up three fingers (your thumb, your index finger, and your middle finger) on one hand to help you remember that you have three of something.
You can also count higher numbers by using both hands. You can start with your left hand and count all your fingers (1, 2, 3, 4, 5), then move on to your right hand and count all those fingers (6, 7, 8, 9, 10).
Finger-counting is a great way to keep track of how many things you have or how many times you've done something. It's also a helpful tool when doing simple math problems, like adding or subtracting small numbers.