ADA is the first currency of the Cardano protocol.
Ouroboros, Cardano’s Proof of Stake algorithm, requires users to be online, which isn't always possible. Ouroboros allows offline users to delegate their vote to a stake pool of their choice, such as Fractalide's Cardano Stake Pool. This way, users can take part in securing the consensus algorithm and earn rewards.
The Cardano Shelley release is due around Q4 2019, and shifts the architecture to a completely decentralised Cardano. Fractalide's Cardano Stake Pool will then go live.
Centralised mining is an issue for currencies like Bitcoin, because when pools get too big and centralised, it can lead to an attack on the consensus protocol. Being on Cardano, Fractalide's stake pool participates in a process that avoids centralisation.
Cryptocurrency users take part in mining and earn rewards. Cardano allows you to nominate another party, like Fractalide, to vote on your behalf to make it easier. If you nominate someone else, both you and your nominee will be rewarded through the Cardano blockchain, which removes the fear of theft.
We'll make our costs and spendings transparent. If you appreciate Fractalide and want your experience improved, then nominate us to stake for you. The more nominators the lighter it is for everyone. All pool earnings (not nominator earnings), after server costs, goes into development of the open source Hyperflow dapp browser. By nominating Fractalide, you're helping improve Fractalide and the Cardano ecosystem.