Cookies

Cookies (cookies) are a small piece of data sent by a web server and stored on the user's computer. A web client (usually a web browser) sends this piece of data to the web server as part of an HTTP request whenever it tries to open a page on the corresponding site. Used to save data on the user side,
in practice it is usually used for:

user authentication;
storing personal preferences and user settings;
tracking the state of the user's access session;
user statistics information.
Browser support for cookies (acceptance,
saving and subsequent transfer of saved cookies to the server) is required by many sites with access restrictions, most online stores. Customizing the design and behavior of many websites to individual user preferences is also based on cookies.