The internet tends to give a good description of teletyping when referring to "ancient" computer systems (basically, computers before PCs, lol) but im not sure of how they relate to computers we use today. I read somewhere that the BIOS uses teletyping, and when i go to background terminals in Ubuntu it lists the OS Name, computer name, then tty (which stands for "teletyping")
Could anyone give a complete-as-possible (or as complete as you want) description of the way teletyping is used in modern computers?