Native is not a tool, nor a goal. Native is an implication of a user experience and performance. Very few non-native applications provide the same experience and performance as native applications (although there are exceptions and it's not always black and white).

"Native" is the implication that a certain level of comformity is present: the user generally gets an experience that is similar to other native applications.

As you develop with native APIs, and when you follow the best practices for the platform, you end up with a product where the UX is much easier to grasp for the user. Non-native solutions very often have different UI/UX patterns, which leads to users having to learn these patterns before the application becomes understood by them.