Answer Posted / Sumit Sharma

Both categories and extensions allow developers to add new methods to existing classes without modifying their original source code. However, there are some differences:n1. Category: It can be applied to any class at runtime, even if the class was not originally designed for the category. Categories have a separate header file (extension) that defines the interface and implementation of the new methods. They can also share the same name with other categories or extensions.n2. Extension: It is only available in Objective-C 2.0 or later versions, and it can be applied to any class, protocol, or namespace during development. Extensions should be used for adding properties and methods to a class that was designed for them. They must have the same name as the original source file.

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