The **`mutableSetOf()`** method in Kotlin is used to create a mutable set. A **mutable set** is a set that allows both read and write operations.

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## Syntax
The `mutableSetOf()` method can be declared as shown below:
```kotlin
fun <T> mutableSetOf(vararg elements: T): MutableSet<T>
```
* `elements`: The elements to be added to the set.

## Return value
The `mutableSetOf()` method returns a mutable set containing the specified elements.

## Example
Consider the code snippet below, which demonstrates the use of the `mutableSetOf()` method.


fun main(args: Array<String>) {
    val set1 = mutableSetOf("aa", "bb", "cc")
    println("set1: " + set1)
}

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## Explanation
The `mutableSetOf()` method is used in *line 3* to create a mutable set of the three elements declared as parameters.

What is the mutableSetOf() method in Kotlin?

Creates a mutable set; allows read/write operations, returns set with specified elements.