A custom domain name is what people type into their browsers, i.e. ‘www.websitebuilderexpert.com’. Some website builders give you a year’s free domain when signing up to a premium plan, but expect this to renew at around $10/year. If you’re on a free plan, you’ll get given a sub-domain which includes the website maker’s name, e.g. ‘www.websitebuilderexpert.wix.com’.