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What are cookies A cookie is a small piece of data that a website asks your browser to store on your computer or mobile device. The cookie allows the website to "remember" your actions or preferences over time.Most browsers support cookies, but users can set their browsers to decline them and can delete them whenever they like. Websites mainly use cookies to • identify users • remember users' custom preferences • help users complete tasks without having to re-enter information when browsing from one page to another or when visiting the site later. Cookies can also be used for online behavioural target advertising and to show adverts relevant to something that the user searched for in the past. How they are used The web server supplying the webpage can store a cookie on the user's computer or mobile device. An external web server that manages files included or referenced in the webpage is also able to store cookies. All these cookies are called http header cookies. Another way of storing cookies is through JavaScript code contained or referenced in that page. Each time the user requests a new page, the web server can receive the values of the cookies it previously set and return the page with content relating to these values. Similarly, JavaScript code is able to read a cookie belonging to its domain and perform an action accordingly. What the different types of cookies are • A cookie can be classified by its lifespan and the domain to which it belongs. • By lifespan, a cookie is either a session cookie which is erased when the user closes the browser or persistent cookie which remains on the user's computer/device for a pre- defined period of time.