Objective-C and Swift are both programming languages that are primarily used to develop apps for Apple's platforms such as iOS, macOS, and watchOS. However, there are some key differences between the two languages. Objective-C is an object-oriented programming language that is derived from the C language. It was developed by Brad Cox and Tom Love in the early 1980s and was the primary programming language for developing iOS apps until 2014. It is known for its dynamic binding, runtime flexibility and its ability to coexist with C code. Objective-C uses a message-passing syntax and dynamic binding to interact with objects, which can make it more difficult to understand for developers who are not familiar with the language. Swift, on the other hand, is a modern, high-performance programming language that was developed by Apple and introduced in 2014. It is designed to be safer than Objective-C and more expressive. Swift has a syntax that is more similar to other modern programming languages like Python, Java and JavaScript. Swift has a type-safe and syntax optimized for development, making the code more readable and expressive. Swift also has a more modern feature set and is less prone to errors. In summary, while Objective-C is an older and more established language, Swift is newer and more modern, and it is generally considered to be easier to learn and use, with a more modern feature set.