Creating blocks is key to keeping the blockchain secure. This happens through mining. Miners race to solve a tough puzzle called proof-of-work. The winner gets to make a new block. This block holds approved transactions, a unique code from the last block, and its own special number. After creation, the block is shared with all the computers on the network. If it checks out, it’s added to the blockchain. This makes sure the chain is safe and unbroken. New blocks keep getting added, growing the chain safely over time.