A smartnode is an online computer that runs a Raptoreum node. It helps the network make important decisions, such as locking transactions with InstantSend, coordinate mixing of coins, and voting on budget funding. A smartnode is required to have 1,800,000 Raptoreum as collateral, a dedicated IP address, and be able to run 24 hours a day with no connection loss.
Sullynode provides and maintains smartnodes for you, so you don't need to stress about anything