Differences between LED drivers

I have some questions about the LED drivers

Why there some chips that we called "LED drivers"?

Wht is the special features they got in general from the others?

As sometimes we can simple using MOSFETs or transistors to compose a driving circuits

Any advantages or drawback for both of them?

Thanks

In general the LED Drivers are designed to handle higher currents. Discrete components also work well in that application.

the drivers have inbuilt shortckt protectn , dimming capabilities, low standbymode power consumptn etc