Under certain circumstances, an iPhone or iPad user can enjoy their iOS device by installing apps, using tools for school, university, work, and even hobbies like cooking, exercising, and much more; however, jailbreaking makes it much more enjoyable because you can install many more tools and utilities for apps, games, the system, etc.
The fact is that Apple has never allowed jailbreaking in any way; lately, the company has focused heavily on improving system security, preventing jailbreaking in the latest versions of iOS 9. However, Pangu is about to release a jailbreak for iOS 9.3.3.