PhoneGap allows you to use regular web technologies to create a mobile app. It is essentially a website wrapped in an app. We've had some success with these, and they seemed like a good fit for software teams that primarily work with web technologies. They also can help reduce the cost and time of development, and work across both Android and iOS which helps you reach the full market. Another benefit is that you can reuse code across your website and your mobile app.
We're recommneding people stop using PhoneGap for a few reasons. In 2020, Apple will start rejecting apps that use web technologies for core features. Also, it's very easy to create a low quality user experience using PhoneGap. Instead, we'd recommend you create a Progressive Web App.