Let's Understand Blockchain word Itself. Blockchain is a Chain of Blocks interconnected with each other and Every Block Containing the Hash of Previous one (How Blockchain Hashing algorithim works we will understand it coming days)..

Let's get onto defination of Blockchain. Blockchain is a distributed, Immutable Ledger which is Completely transparent and Secure.It is used to store and and transfer Information without interfernce of Centralized Authority..

So Now Let's Understand Word by word.

Distributed:Distributed mean Blockchain is Distributed to all nodes(computers).So all the nodes have a copy of blockchain data and New data added to blockchain is added onto every node in the Network.

Dectralized:Blockchain is Dectralized which mean once Data stored on it cannot be alter or changed so it is temper proof and Safe method of storing data.

Transparent:It is transparent because of its record is Visibile to all the Nodes in the Network but no body knows who's data is it because it is in Encrypted form(Using Hashing SHA-256 Algorithim).

At the End If a node in the Network is hacked what will happen to the Data on that node.
So Even if a Block is hacked maybe its data is lost on that Particular Computer but as we all know that Blockchain os distributed Immutable ledger, The data hacked on one Block is Present on Thousands to Million of block which can be easily recovered..

These all Facts make Blockchain a Safe and Secure Way of storing sending and using data.Do not confuse Blockchain Is Cryptocurrency only it has far more uses and we will see them in Web3.#data