Typeface:
Design for set of characters.
Composed of glyphs that share common features.
Represents one aspect of font.
Two categories of fonts: Serif and Sans-Serif.

Glyphs:
Graphic symbol intended to represent readable letter which is used for writing.

Serif:
Serif is a small line attached to end of letters.
Individual letter are more distinctive.
And makes our brain to spend less time while reading.
Example:


Sans-Serif:
Sans means without.
Sans serif is better for reading.
Example: