Native apps are built through the software development kit(SDK) of OS. Native apps are available free or in-app purchase option in app stores. The user can download them and use them. Apple and Google provide their own development tools, interface elements, and standardized SDK; Xcode and Android Studio. So the developer can use it and build apps easily. As Native apps have OS oriented designs, iPhone and Android apps must be created separately from each other.
Hybrid apps are the combination of Web and Native Apps. Like native apps, they are available in App stores and Like web apps, they rely on HTML being rendered in a browser. Hybrid app development is trending because it is with cross-platform development and hence reduce development costs. Means one app can run in the different OS.