Block and chain, as the word suggests, a series made of blocks! So we know what are these blocks. Blocks can be 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 this database is https://gregoryewof60481.digitollblog.com/30371194/what-is-blockсhain-technology-and-how-does-it-work