What is gello?

Jell-O is the brand name of a Gelatin-based fruit-flavoured snack.

Gelatin is made from cartilage, usually pork. Some kosher / halal gelatin is made from fish.

Vegans and most vegetarians do not eat gelatin. Substitutes include agar agar (algae-derived), carageenan (kelp-derived), and corn starch.