Where the average letter that doesn’t have ascender height or descender height, for example the letter “c” the top sits at the mean line and the bottom sits at the baseline.
The portion of a letter that goes above or below the average height for example the letter “p” goes below and “h” goes above.
The process of adjusting the spacing between letters for visually aesthetic results.
The space between lines of text, it’s measured from the baseline of a letter
Sans means without, and serif is a small flick off a letter, so Sans-Serif is without these
Small projecting lines off the ends of a letter (in red)