"EVERYTHING WILL BE TOKENIZED AND CONNECTED BY          BLOCKCHAIN ONE DAY"   -- Fred Ehrsam 

                                                     
                                                     
WHAT IS A BLOCKCHAIN ?
As the name indicates, a Blockchain is a chain of blocks that contains information 
A blockchain is, in the simplest of terms, a time-stamped series of immutable records of data that is managed by a cluster of computers not owned by any single entity. Each of these blocks of data (i.e. block) is secured and bound to each other using cryptographic principles (i.e. chain).It's like a public ledger which is secured and open to all.
So, what is so special about it and why are we saying that it has industry-disrupting capabilities?
The blockchain network has no central authority — it is the very definition of a democratized system. Since it is a shared and immutable ledger, the information in it is open for anyone and everyone to see. Hence, anything that is built on the blockchain is by its very nature transparent and everyone involved is accountable for their actions.


BLOCKCHAIN EXPLAINED
A blockchain carries no transaction cost. (An infrastructure cost yes, but no transaction cost.) The blockchain is a simple yet ingenious way of passing information from A to B in a fully automated and safe manner. One party to a transaction initiates the process by creating a block. This block is verified by thousands, perhaps millions of computers distributed around the net. These computers are actually the users participating in the network. The verified block is added to a chain, which is stored across the net, creating not just a unique record, but a unique record with a unique history. Falsifying a single record would mean falsifying the entire chain in millions of instances. That is virtually impossible. Bitcoin uses this model for monetary transactions, but it can be deployed in many other ways.

The Hash of each block is connected to the previous block through a cryptographic hash function. 
BLOCKCHAIN USECASE
Think of a railway company. We buy tickets on an app or the web. The credit card company takes a cut for processing the transaction. With blockchain, not only can the railway operator save on credit card processing fees, it can move the entire ticketing process to the blockchain. The two parties in the transaction are the railway company and the passenger. The ticket is a block, which will be added to a ticket blockchain. Just as a monetary transaction on the blockchain is a unique, independently verifiable and unfalsifiable record (like Bitcoin), so can your ticket be. Incidentally, the final ticket blockchain is also a record of all transactions for, say, a certain train route, or even the entire train network, comprising every ticket ever sold, every journey ever taken.
But the key here is this: it’s free. Not only can the blockchain transfer and store money, but it can also replace all processes and business models that rely on charging a small fee for a transaction. Or any other transaction between two parties.


REPLACING OLA OR UBER
OLA and Uber charge the drivers 10-20 percent of their earnings which increases the overall cost and in this entire process, they also capture the personal details of the customer like their mobile phone numbers, address, email ids, etc. which can undermine privacy.
Blockchain offers solution to both of these Problems .
You don’t need a separate Ola app. You get an app which is built on the blockchain. Everyone gets this app. The rest of the process remains  same. You need to register and log in the app just like you used to do it in Ola or Uber.  Further, the entire process is aided by an inbuilt payment system. It can be Ethereum or Bitcoin thus cutting down the need of relying on an intermediary for payment.


OTHER USE CASES OF BLOCKCHAIN
 -> SUPPLY CHAIN MANAGEMENT 
 ->DIGITAL IDENTITY
 ->FUNDRAISING
 ->VOTING
 ->ENERGY MARKET
 ->REAL ESTATE
 ->INTELLECTUAL PROPERTY