Your phone can be the gateway to the world, a way to stay in touch with your friends and family, or a way to pass the time and have a little fun. But it can also be a tool if you develop mobile software.
Someone who writes apps or builds third-party accessories needs a way to properly test them, and that means they need to actually use a phone (or a tablet and even a watch!) sometimes. Google knows this — because they also need to test apps and assorted software changes — and has provided an easy-to-access set of developer options in the settings of every Android phone.
More than USB debugging
You might have enabled the developer options and selected to use the USB debugging setting so you can do things like sideloading a security patch or unlocking your phone’s bootloader. But there is a lot more in there.