Ability is a big word that means how good you are at doing something. It's like when you learn a new thing, some things are easy for you to learn, and some things are hard for you to learn.
Let's say you're learning to ride a bike. You might be really good at it and have a great ability to ride, or you might find it hard and struggle to keep your balance. But, with practice and patience, you can improve your ability to ride the bike.
Just like riding a bike, you can have abilities in all sorts of things like writing, drawing, playing soccer, singing, cooking or even doing math. Some people have a natural talent for certain things and have a higher ability than others. But, it doesn't mean that you can't improve your abilities with practice and hard work.
It's important to remember that everyone has different abilities, and that's okay. It's what makes us all unique and special. As long as you try your best and work to improve your abilities, you can achieve great things.