Variables and Constants in Swift

Variables in Swift:

In Swift, variables associate an identifier with a value of a particular type such as the String or Int type, where the identifier can be used to retrieve the value. It tends to be more common in software development than constants. This is mainly because developers tend to prefer variables over constants. In Swift, we receive a warning if we declare a variable that is never changed.

Constants in Swift:

Constants are good for defining values that you know will never change, like the temperature that water freezes at or the speed of light. Constants are also good for defining a value that we use many times throughout our application, such as standard font size or the maximum number of characters in a buffer.

The difference between a constant and a variable is that a variable can be updated or changed, while a constant cannot be changed once a value is assigned to it.