As in most other programming languages, a Boolean type in Sabre has two possible values: `true` and `false`. Booleans are one byte in size. The Boolean type in Sabre is specified using `bool`. For example:
```
fn main() {
let t = true
let f: bool = false // with explicit type annotation
}
```
The main way to use Boolean values is through conditionals, such as an `if` expression. We’ll cover how `if` expressions work in the ["Control Flow"](introduction/control-flow.md) section.
## The Integer type
The `integer` datatype represents a 4 byte decimal number.
