SITE.su is an online marketplace specializing in premium domain names, including keyword-based domains and websites in the .ru, .su, and .рф zones. The store presents a catalogue of more than 40,000 domains and enables customers to purchase or rent names through its website. Buyers can complete a purchase online, with domain administration rights transferred to them. For rentals, customers may assign their own DNS servers; rental agreements also provide a priority right to buy the domain during the agreement period, with the purchase price fixed in the contract. Rentals are priced by calendar month, and agreements can last up to 50 months.

Customers can search by one or more words, use advanced search filters, view matching domains, or download the full catalogue as an Excel file. Domain listings include details such as price, age, and SEO-related indicators. The site also offers a contact form for questions or price proposals, alongside help and online chat. SITE.su serves businesses and individuals seeking distinctive domain names for online projects, promotion, or brand development.