What's the difference between UberX, XL, Comfort, Black, and SUV(02)

What's the difference between UberX, XL, Comfort, Black, and SUV(02)

Video Screenshot Gallery: Uber Xxl Size

Uber super-sizes service, adds 'uberXL' in Baltimore - Technical.ly
Uber XXL? New Ride Type in Orlando//@therideshareculture - YouTube
What's the difference between UberX, XL, Comfort, Black, and SUV