SITE.su is an online marketplace specializing in premium domain names for businesses, website owners, and individuals developing online projects. The store lists more than 39,000 domains, including keyword-based names and existing websites in the .ru, .su, and .рф zones. Its catalogue is organized around matching terms, synonyms, translations, and transliterations, helping visitors explore names related to a particular subject or search more widely.

Customers can purchase domains online with immediate transfer or rent them by assigning their own DNS servers. The marketplace also offers rental arrangements with a guaranteed right to buy, giving customers an option to use a domain before acquiring it. Listings show purchase prices and monthly rental rates, and some include information such as domain age and available rating or search statistics.

Visitors can browse the full catalogue, download a domain list in Excel, or use advanced search filters. For a specific listing, they can submit a question or price proposal through the site, with contact options and online chat available in the help section.