Cookies are strings of data that a web server sends to the browser. When a browser requests an object from the same domain in the future, the browser will send the same string of data back to the origin server.
The data is sent from the web server in the form of an HTTP header called “Set-Cookie”. The browser sends the cookie back to the server in an HTTP header called “Cookie”.
Key Takeaway
There are two sorts of cookies:
session cookies If a cookie does not contain an expiration date, it is considered a session cookie
persistent cookies If the cookie contains an expiration date, it is considered a persistent cookie
Session cookies are stored in memory and never written to disk. When the browser closes, the cookie is permanently lost from this point on.
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Cookies are mainly used for three purposes:
Session management Logins, shopping carts, game scores, or anything else the server should remember
Cookies can make you more efficient. Have you ever tried to made a purchase in a web shop and returned a few days later to complete the purchase and found out that your purchase was still in the basket? This is a good example of the use of cookies.
Personalization User preferences, themes, and other settings Cookies are used to store preferences and usernames or to register products and services that match your needs.
Tracking Recording and analyzing user behavior Cookies tell us how often and how many pages you have accessed so we can conclude what information has your interest. This way we can offer you more information you are interested in and less in which you are not interested in.
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