When you are browsing websites on the internet, many of these websites store text files called cookies on your computer, laptop, mobile device etc. Cookies help track your use of the site and to personalise your journey around the website. These cookies can be stored so that if you return to a website, that website server can call the information from the cookies stored on your computer to tailor your experience of the site.
Cookies are perfectly safe to be stored on your computer and almost all web browsers have cookie storing enabled as default. However, all browsers have the option of disabling cookies being stored on your computer if you wish to do this.