Cookies are small text files that are stored on your computer or mobile device when you visit a website. They are used to remember your preferences, login information, and browsing history, among other things.
When you visit a website, the server sends a cookie to your computer or mobile device. This cookie is then stored on your device and sent back to the server with each subsequent request you make to that website. This allows the website to remember who you are and provide you with a personalized experience.
Cookies can also be used to track your browsing history and preferences, which can be used for targeted advertising. This can be both a positive and negative aspect of cookies, as it allows for more relevant ads to be shown to you, but it can also be seen as a privacy concern.