What is the difference between Any and AnyObject types in programming, and what are their main differences?

In Swift (iOS), the types Any and AnyObject have the following differences:

• Any is a universal type that can represent a value of any type, including classes, structures, enumerations, functions, and primitives.

• AnyObject is a type that can only represent instances of classes (i.e., reference types).

Main differences:

• Any covers all types, including value and reference types.
• AnyObject is limited to reference types only (classes).

Example:

let anyValue: Any = 42          // Int — a value type
let anyObjectValue: AnyObject = NSString(string: "Hello") // NSString class

// The following line will cause an error because Int is not a class
// let invalidAnyObject: AnyObject = 42

Thus, Any is more versatile, and AnyObject is used when you need to work only with class objects.