Remember walkie-talkies? I had one when I was a pre-teen, and thought it was really cool. At one point, I got a radio with CB channels, and could hear truckers and the like. It was quite popular in the 70s. For a variety of reasons, CB radio isn't used much, and radios and radio frequencies have evolved since then, with a farily complex system of rules and regulations.
The first is FRS, which stands for Family Radio Service . This uses frequencies in the 462 and 467 MHz range. It's unregulated, and is generally low-power and short-range. There are a lot of FRS radios out there, and they are pretty easy to use, and have particular channels allocated.
There is some overlap between the use of FRS, which does not require a license, to the use of GMRS, which does. Most GMRS radios can also use FRS frequencies, although that is apparently illegal after 2019. The bulk of this blog post is going to be about GMRS, as I've been using it a fair bit for the last year or so.