Etiquette is the code that governs the expectations of social behavior and the conventional norm.
It refers to norms and standards for behavior that is socially acceptable and being comfortable around people.
Etiquette fundamentally prescribes and restricts the ways in which people interact with each other, and show their respect for other people by conforming to the norms of society.
This word came from an old French word meaning ticket.
Etiquette in simpler words is defined as good behavior which distinguishes human being from animals.