Can you list the main classifications of objects used in Swift?

In Swift, objects can be classified into several main types:

• Classes — reference types, support inheritance, can have deinitializers.
• Structures — value types, copied when passed, do not support inheritance.
• Enums — allow defining a set of related values, can have associated values and methods.
• Protocols — describe an interface that can be adopted by classes, structures, and enums.
• Tuples — group multiple values into a single composite type.

Each of these types is used depending on the task and the specifics of memory management and object behavior.