| 0 | FALSE |
| 1 | TRUE |
Named after a guy called George Boole, the Boolean data type is a particularly lightweight data type. It has only two possible values, and thus only takes one bit to store. Most of the time, '0' represents 'false' and '1' represents 'true'. If you don't believe me, open up your spreadsheet software and type in a formula with TRUE or FALSE (such as RANK or VLOOKUP), then replace TRUE with 0 and FALSE with 1.
Yeah, that's pretty much it.
Of course, there's a lot more to Boolean logic than just TRUE and FALSE, but this is lesson is mainly about data representation, and there's no point going into AND, OR, NOT, XOR, NOR, NAND, union, intersection and complement here.
Do note that in many situations, any number that isn't 0 (that includes 2, -1, etc.) is treated as TRUE. You should try it sometime.