Summary  
The chapter explains how to declare immutable and mutable Boolean variables in Kotlin, shows type inference for Booleans, and highlights their use in logical expressions and conditions.  

General domain of usage  
Control flow and conditional logic

## Declaring Boolean Variables

In Kotlin, you declare a **Boolean** variable using the `Boolean` type. Boolean variables can hold one of two values: `true` or `false`.

### Syntax for Declaration

Use the `val` keyword for a read-only (immutable) variable, or `var` for a mutable variable:

```kotlin
val isActive: Boolean = true
var isEnabled: Boolean = false
```

- `val isActive: Boolean = true;` declares an immutable Boolean variable named `isActive` and sets its value to `true`;
- `var isEnabled: Boolean = false;` declares a mutable Boolean variable named `isEnabled` and sets its value to `false`.

You can also let Kotlin infer the type:

```kotlin
val isVisible = true
var isComplete = false
```
- Here, `isVisible` and `isComplete` are both Boolean variables, with their types inferred based on the assigned values.

**Boolean** variables are essential for controlling program flow, as they are used in conditions and logical expressions.

Which values can a variable of type Boolean hold in Kotlin?

A beginner-friendly course introducing the essential control flow concepts in Kotlin. Learn how to make decisions, repeat actions, and structure your code using if, when, loops, and more. Each chapter features clear explanations, practical code examples, and a quiz to reinforce your understanding.

Learn the foundation of decision making in Kotlin: Boolean types, comparison operators, logical operators, and combining conditions.

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Deepen your understanding of conditional logic in Kotlin by mastering the when expression. Learn to replace long if–else chains, use multiple conditions, ranges, and return values with when.

Boolean Type and Values

Declaring Boolean Variables

Syntax for Declaration