Double-click is when you use a mouse to tap the left button twice quickly. This is like knocking on a door to get someone's attention twice.
When you double-click something, it does something special. This might be opening a file, program, or webpage.
It's important to double-click quickly, because if you wait too long between clicks, it might not work. And if you accidentally double-click, you might do something you didn't mean to.
But don't worry, with some practice, you'll be a double-click expert in no time!