25.1-Closures part-1 in Swift(iOS) | iPhone | iPad
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Closures are mainly used for two reasons:
Completion blocks:
Closures help you to be notified when some task has finished its execution. See Closure as a completion handler to learn more about it.
Higher order functions:
Closures can be passed as an input parameters for higher order functions.
A higher order function is just a type of function that accepts function as an input and returns value of type function as output.
For this purpose it's better to use closures in replacement of function because closure omits the func keyword and function name that makes the code more readable and short.