When you register a domain name you are required to provide genuine contact details that are then associated with that domain. This is referred to as WHOIS information. These details are then freely accessible to anyone looking up your domain name. Unfortunately, this information is then regularly used by direct marketers, spammers and other third parties wanting to acquire your contact details. This in turn tends to lead to you seeing an increase in, junk mail, email spam, sales calls, and sometimes your personal details can be sold on to more 3rd parties.