A custom domain refers to a personalized and unique web address that you can register and use for your website or online presence. Instead of using a generic domain provided by a hosting service (e.g. yourwebsite.hostingservice.com), a custom domain allows you to have a distinct and branded web address (e.g. www.yourwebsite.com).
To obtain a custom domain, you typically need to register it through a domain registrar, which is a company accredited to manage domain registrations. Popular domain registrars include GoDaddy, Namecheap, and Google Domains. Once you register a custom domain, you have the right to use it for a specified period (usually annually, although longer registration periods are also available).