The blockchain is a distributed ledger technology (DLT). It records data and powers cryptocurrencies. it's like the internet of Bitcoin.
There are public and private blockchains. You'll also find them in consortiums or hybrid domains. Public domains are the most common where anyone can join.
Blockchains are all over. It's like the internet 3.0. As the world transitions in to the future, it will be vital to learn how this piece of technology works.
Transactions are executed on the blockchain and stored in blocks. The connection of these blocks is the blockchain. A distributed consensus mechanism confirms the transactions.