#Tabs and Tab size
Once, long ago, when computers were not so wide-spread as they are today, using Tab characters was much simpler. Why ? Everybody new what the size of a tab character was. At the beginning, the tab size was 8.
You can still see this today. Printers could receive text for printing directly on the printer port (usually a parallel port or a serial port (RS-232C)), and would print it in a manner similar to a console or terminal, so without formatting and without using a word processor, like the one from Microsoft. I believe many printers can still do this today, and if you can identify the printer port by name, you can use the copy command to print a text file. And printers used a tab size of 8, and nobody questioned it, because at the time they had no reason to.