True certified digital signatures have been about for some time, but as the EvilMonkee says isn’t yet widespread on a personal basis - though I was using my personal one 15 years ago, and doubt it’s been put to use for much less than that, definitely more than a decade
Old people may remember Ceefax, which was a form of internet on your TV, two way communication versions such as Prestel were used for some industries and dated back to the early 80s. Prestel didn’t pick up well here with dial
up Bulletin Boards being preferred by British geeky types
In France Minitel home terminals were distributed by a phone company as an investment to save on updates to printed phone directories, and stayed popular with its various online services. This lasted about 30 years in france, well into the internet age
Faxes gained popularity about 10 years before Ceefax, Prestel, Minitel etc and has lasted for longer. Generally we won’t see faxes and will think to email instead but their value in transferring a tangible duplicate remains, complete with legal recognition where applicable
I can forsee that even when personal digital signatures become widespread, that faxes will still have their niche areas for some time
Before covid there was still a real fax in my office, but with a steady change across to personal Skype numbers we still had desktop phones. During Covid the phones left the desks, and only a handful remain as fall backs.
I’ve still not even noticed whether or not the fax is one of them