The American Radio Relay League (ARRL) Field Day is an annual event in which amateur radio clubs and individual amateurs can participate to demonstrate their emergency communications capabilities.
I took my camera and got a few shots of the operation; there were three stations working in the schoolhouse. The first station seen in the (clickable) image below is the CW station, or communications via Morse Code. I am surprised that having been off the air for a while that I could still copy the Morse callsigns and text in my head as I listened.
The next station seen below is a digital modes station; there are several digital modes available and they all work to transmit text or possibly images via a computer interface.
The third and final station is a voice mode station that probably is using a popular voice mode called Single Sideband (SSB).
All of the stations had a computer on the side to perform the logging necessary for the contacts made. Logs are submitted to the ARRL which issues awards to contest winners in the various categories.
I have to admit that I thought about getting back on the air, but some matters related to home repair will have to take precedence. More on that situation at another time.