A web address part is a component of a website's URL. It consists of two parts, the 'DOT' and the 'com'. The DOT is a three letter code that indicates the type of website, such as '.org' for an organization or '.edu' for an educational institution. The 'com' is a three letter code that stands for 'COMMERCIAL' and indicates that the website is a business. Together, these two parts make up the web address part of a website's URL.