Chances are that your app interacts with a web service in some capacity. And when it does, the data you're getting back is most likely JSON.
Codable provides the best way to map those JSON payloads to your Swift models. Thanks to automatic code synthesis from the compiler, tasks that used to take hours of engineering and hundreds of lines of boilerplate can now be done in a few moments - often with little to no additional code.
This book offers a comprehensive look at all aspects of Codable, starting with the basics, and exploring a variety of advanced topics through engaging example projects.