A cookie is a piece of information that a website transfers to files of the browser on your computer's hard disk so that the website can remember certain information about you each time you visit a website. This can include which pages you have visited, menu choices made, information you have entered into a form and when you visited the site.
Session cookies are temporary cookies that expire at the end of a browser session, i.e., when you leave the site. These allow the website to recognise you as you navigate between pages during a single browser session and allow you to use the website most efficiently. For example, session cookies enable a website to remember that a user has placed items in an online shopping basket.
In contrast to session cookies, persistent cookies are stored on your devices between browsing sessions until they expire or are deleted. They enable the website to remember you on your return, remember your preferences and tailor the website experience to you.
Most browsers are initially set to accept cookies. However, you have the ability to disable cookies through changing the settings for your browser. It may also be possible to configure your browser settings to enable acceptance of specific cookies or to notify you each time a new cookie is about to be stored on your computer enabling you to decide whether to accept or reject the cookie.