Blockchain technology allows everyone to hold and make transactions as strangers but in a completely transparent manner. There is no mediator in between two people making the transaction, and the entire process becomes easier and cheaper. This concept can be applied to the entire digital world, making any kind of exchange/transactions secure.
The below infographic provides a snapshot of companies and the broad applications that they are providing over blockchain. These include both non-financial and financial/currency-related (bitcoin and other digital currencies) applications.