system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: AM & FM frequencies.

What is the difference?
On FM you can only go from station 88 to 108
On AM you can only go from station 530 to 1710
Why is it that cars can only intercept those frequencies?

Edit) please also help me understand ham radio.
gpt
Ham radio operator here. There is a lot of good information about the differences in Frequency Modulation and Amplitude Modulation. But the question was, why is FM 88 to 108 and AM 530 to 1710. 

The FCC in the USA (more globally, the ITU in the United Nations) designates the frequencies to be used for specific purposes. Almost every wireless device is designated a specific frequency or range of frequencies to use. 

AM broadcast radio is designated 540 KHz to 1600 KHz (1.6 MHz)  
FM broadcast radio is designated 88,000 KHz (88 MHz) to 108,000 KHz (108 MHz)

The numbers on the radio dial are just the frequency in KHz for AM and in MHz for FM. Your radio can only dial to these frequencies because it was only designed to pick up those frequencies. 

And yes, there are other frequencies, but they are used for other things.