# What are unit cells, and how do you determine the number of atoms in one of them?

I've read several websites to try to figure out what exactly a unit cell is, but I can't seem to understand it. Could someone explain what a unit cell is, and the different types? Thanks!

• Thank you MaxW, in bcc can we say two atoms at$000$ and $1/2 1/2 1/2$ form a unit cell? Their repetition will lead to generation of entire lattice. – Kashmiri Nov 26 '20 at 16:10