Blockchain was also made with a mysterious name Satoshi Nakamoto. Blockchain is a public and digital ledger it is commonly used in transaction and business. It is the most trusted all in one in crypto's company. The real usage of blockchain is to record all the transaction inside bitcoin and it is also known as a database it also records information publicly and chronologically. It is a growing list of records that are called blocks. That's why it called blockchain because it looks like a block of chain.