Websites can determine if you are a first-time or a returning visitor. The first time that you visit a website, your computer is assigned a ID number and a record of the date is stored in a file called a cookie. The next to you go to this same website, this cookie is read to determine if you have been to the website previously. These cookies are used for the purpose of displaying ads, for a first-time visitors these ads could be introductory advertising and for a repeat visitor the ads could differ and appear as never seen before ads. These ads are often targeted to your shopping interest and interests.