HTTP Cookies — also known as web cookies, browser cookies, or simply just cookies — are small pieces of data sent from a web server to a user’s browser.
Cookies consist of a name and a value. For example, a cookie used for session management might have a name like
usr_session, and the server might automatically generate a unique session ID as that cookie’s value. In addition, cookies can optionally have one or more additional name-value pairs that define certain attributes, like the cookie’s expiration or various security settings.