SITE.su is an online marketplace for premium domain names, offering customers a broad selection of keyword-focused domains for businesses and digital projects. The store lists more than 40,000 domain names, primarily in the .ru, .su and .рф zones, and provides tools to search by words or other criteria, review matching names, and download domain listings for further research.

Customers can purchase a domain online or rent it by the month. Purchases involve an immediate transfer of domain administration rights, while rental lets the customer set their own name server addresses. Rental agreements include a priority right to buy the domain during the agreement term, with the purchase price fixed in the contract; agreements may run for up to 50 months. The site displays purchase and monthly rental prices, along with details such as domain age and a rating based on search-related indicators. For questions or price negotiations, customers can contact the store through its help section or submit an inquiry about a specific domain.