It’s the visual spacing between letters, which usually involves some letters that have curves or corners to actually not strictly follow the spacing. For example the legs of the letter A might stick out a tiny bit in certain fonts. This gives text a more visually balanced kerning.
Relevant xkcd
Is kerning the spacing between letters?
Between any typographical characters, but yeah, basically 🙂
It’s the visual spacing between letters, which usually involves some letters that have curves or corners to actually not strictly follow the spacing. For example the legs of the letter A might stick out a tiny bit in certain fonts. This gives text a more visually balanced kerning.