Hmmm, now that I’ve typed that headline, I’m wondering about some potential earlier digital modes. Things like smoke-signals and drum messages have some of the same characteristics. Even so, I’ll restrict this discussion to radio frequencies and to amateur radio.
One of the things that I like most about our hobby is the extremely wide array of activities available. Plus, you can get involved at whatever level best suits your interest, your available time, or your pocketbook. That includes CW, or Morse Code operation, from low-speed straight-key conversations to high-speed telegraphy competitions. CW has something for everyone.