NEO is an alternative to Ethereum. It powers smart contracts. Like most other blockchains, it fails to scale. Trinity is a scaling solution for the NEO blockchain. Its features are mostly the same as the lightning network for Bitcoin. It provides private and instant transactions by sending all transactions off chain. The blockchain is used only as a judge when something goes wrong or one party decides to not play nice. This is very useful for small value payments and in game micro transactions. It may probably scale to millions of transactions per second.