Stellar is an open-source blockchain protocol that is vertically focused to issue and exchange assets on their distributed ledger technology (DLT).
To validate transactions, validation servers run a software implementation of the protocol, and use the Internet to connect to and communicate with other Stellar validators, forming a global value exchange network. Each validator stores a record of all accounts on the network and share one global ledger.
Each validator must come to agreement on which set of transactions to apply to the current ledger through a process called “consensus”. The consensus process happens at a regular interval, typically every 3 to 5 seconds.
This keeps each server’s copy of the ledger in sync and identical.
The Stellar network has been winning some ICO's over the Ethereum network due to some of the drawbacks of Ethereum like high transaction fees, long confirmation times and network scalability issues.