The ADA owners can create new blocks, perform and validate new transactions. Any node on the network that holds a positive stake value is considered a stakeholder and therefore qualifies to become a slot leader.
Using the platform’s Proof-of-Stake (PoS) algorithm, the selection process for the stakeholder who will create the next block is random, but also proportional to the stake they hold on the platform. The relative value of their stake is calculated as a fraction of the tokens on a specific node divided by the total number of tokens in the system.