While serif fonts are identified by a small stroke decorating the end of a longer stroke, sans serif fonts lack that extra ornamental stroke.
In typography, certain fonts will have a small line or stroke attached to the end of a larger stroke: these fonts are called serif fonts.
Monospace fonts invoke a retro, tech-oriented vibe: their design style is ideally suited for something like a vintage video game website.
In typography, certain fonts will have a blunt and angular or rounded line at the end of a larger stroke: these are called slab serif fonts.
Script fonts are based on handwriting, and as such they have more variation and fluidity than typeset fonts. They can be casual or formal.
Older generations bemoan younger people not knowing how to write in cursive, but elegant and calligraphic handwriting fonts fill that gap.