You don't need network access for your laptop or smartphone to be useful. Especially in areas where mobile data is expensive, with some proper planning, you can download certain apps that you can sync via free Wi-Fi, and then use them offline elsewhere.
Mobile apps such as Google Maps, FeedMe, and Wikipedia give us offline apps, which can be used anywhere regardless of the Internet. Making our own app offline-compatible is a great way of winning the hearts of our clients.
Let's start this chapter by looking at how to cache critical resources for use offline.