A domain name is the name of a given website. Every website has a String of numbers (IP Address), through which its servers can be accessed, but it is difficult for us to remember the long and complex IP address of every website we want to use. The domain name can be thought of an alias. The domain name of a website is associated with its IP address, so a user only needs to memorize the domain in order to access the particular website. Domains names can be purchased by users. However, no two websites can have the same domain name.