In the early years of emerging Bitcoin, people thought that blockchain is for Bitcoin only, but every day public knowledge on the potentials of this technology is growing more and more. Blockchain is a database for registering information in which the information will be tampered proof and close to impossible to delete. So this is an application for storing some kind of data that might not be altered forever.
Assume blockchain is a righteous judge that no one can cheat him. Digital currencies, banking, elections, insurance industries and so on are few applications of blockchain. With blockchain technology, you can do smart procedures through best and decentralized techniques.