Probably, the most often used feature in all programming languages is creating and storing a value. We create local variables in functions and declare them in classes and other data structures; that's why it's very important to do it properly.
In Swift, there are two ways of creating and storing a value, as follows:
Making it a variable:
var name = "Sara"
Making it a constant:
let name = "Sara"
The difference between variables and constants is that a constant value can be assigned only once and can't be changed after that. A variable value, on the other hand, can be changed anytime. Here's an example:
var name = "Sam" name = "Jon" let lastName = "Peterson" lastName = "Jakson" //Error, can't change constant after assigning