IPhone has 4 series, 5 series, 6 series, 7 series, 8 series and iPhoneX.
IPad:iPad is a series of tablet computers released by Apple in 20 10. It is located between Apple's smartphone iPhone and laptop products, with only one button (there are four virtual program bars on the screen), which is the same as the layout of iPhone.
Apple watch: Apple? Watch is a smart watch released by Apple in September 20 14.