val and var both are used to declare a variable. var is like general variable and it's known as a mutable variable in kotlin and can be assigned multiple times. val is like Final variable and it's known as immutable in kotlin and can be initialized only single time.

val firstName: String = "Chike"

val variable name: Typeofthevariable = TheValueofyourvariable

+----------------+-----------------------------+---------------------------+

|                |             val             |            var            |

+----------------+-----------------------------+---------------------------+

| Reference type | Immutable (once initialized | Mutable (can change value)|

|                | can't be reassigned)        |                           |

+----------------+-----------------------------+---------------------------+

| Example        | val n = 20                  | var n = 20                |

|                | n++                         |                           |

+----------------+-----------------------------+---------------------------+

val name = ”Marcin” // Can't be changed

var age = 5 // Can be changed

age++

val declares a read-only property, var a mutable one