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