Block and chain, because the word suggests, a chain made of blocks! So we know very well what are these blocks. Blocks really are a kind of database! People who work on computers know databases adequately! And for people that do not know, when we say in simple language, then https://canvas.instructure.com/eportfolios/3244972/Home/What_is_Blockchain_Technology_And_How_Does_it_Work?