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Blockchain is a decentralized, distributed digital ledger that records transactions across many computers in a secure, transparent, and immutable manner. It uses cryptography to ensure data integrity and eliminate the need for a central authority or intermediary. Each block contains transaction data and is linked to the previous block, forming an ever-growing chain that cannot be altered without consensus from the network.

What blockchain is ...... For example I will send you ten bitcoins You will receive ten bitcoins But middle of us there is someone called as miners. Miners have very high end supercomputers There job is to store the data regarding the transaction between us. Speciality is 1. Your name and my name is kept secret 2. Nobody can view the transaction between us 3.the data can't be hacked Data is stored in the supercomputers of Lakhs of miners Hackers can hack one computer But can they hack lakhs of computers It's impossible.