Block and chain, because word suggests, a chain made of blocks! So we understand what are these blocks. Blocks really are a kind of database! People who work on computers know databases well! And for people who do not know, whenever we say in simple language, then your database is https://www.maanation.com/post/358020_block-and-chain-since-the-word-suggests-a-sequence-made-of-blocks-so-we-determin.html