A cookie is a small piece of information sent through a website and stored in the user’s browser, so that the website can check the user’s previous activity.
Its main functions are:
• Keep track of users: when a user enters his/her username and password, a cookie is stored so that there is no need to enter them again every time that the user opens a new page. However, a cookie does not identify only a particular person, but a combination of computer-browser-user.
• Obtains information about the user’s browsing habits, and spyware attempts by advertising agencies and others. This can cause privacy problems and is one of the reasons why cookies have their detractors.
Cookies can be deleted, accepted or blocked as desired, in order to do so you just need to configure your web browser.