Introduction

We don't live offline nowadays. It's become very rare nowadays to find an app that has no backend to pull data from, or to be updated by users' actions or by any data that seems important. A lot of apps have a user system where users can log in and register themselves to use the app. Each user has different information or data that needs to be saved. This data needs a server to be saved in and, pulled from any client side (a mobile app or website). Even if you don't have a server, you need a place to fetch data from and keep your app up to date. You don't need an app update in Appstore if you want to update anything in the data you deal with. Some heavy tasks need a server to take care of them, thanks to its power and its accessibility to all information that the tasks need. Networking is one of the core skills that every iOS developer should...