"He who marches out of step hears another drum." ~ Ken Kesey
In the old days, we called this "letter spacing". Learned by many of us old-timers initially in our Junior High print shops hand setting type.It's a pretty basic concept of judging "real estate" and the principle of the more stuff that would be close together (espedcially when the parallel lines of two letters are side by side, the more space is needed.
I set type in junior high too, with a composing stick. I don't remember "kerning" from that time in particular, (leading, sure) but learned it later in high school graphics arts class. In Illustrator, you simply put the cursor between two letters, and hold the option key and the left arrow tightens the space, and the right arrow opens it up. As said, even a wet behind the ears rookie should "see" that.Steve