Codable is added with Xcode 9, iOS 11 and Swift 4. Codable is used to make your data types encodable and decodable for compatibility with external representations such as JSON.
Codable use to support both encoding and decoding, declare conformance to Codable, which combines the Encodable and Decodable protocols. This process is known as making your types codable.
Let’s Take an Example with Structure of Movie, here we have defined the structure as Codable. So, We can encode and decode it easily.