When you visit a website, your computer receives a small file called a "cookie". It's like a little piece of paper that the website gives you to remember things.

The cookie tells the website things like if you have been to the website before, what pages you looked at, and what you clicked on. This helps the website to remember who you are and what you like, so that when you come back to the website later, it can show you things that you might be interested in, or make it easier for you to log in.

Just like how you might write down something on a piece of paper so you don't forget it, websites use cookies to remember things about you so that you can have a better experience when you visit their website again.