# Void type

If your function does not return an explicit type, you will need to use `void` as your return type.

```typescript
function logMessage(message: string): void {
  console.log(message);
}
```

`void` is the absence of having any type at all.

Declaring variables of type void is *possible*; however, it is not useful because you can only assign `undefined` or `null` to them:

```typescript
const unusable: void = undefined; // Allowed, but useless
const unusable: void = []; // Error
```