Appetizers or Hors d’œuvre (in French)   are food items served before the main courses of a meal.
If there is an extended period between when guests arrive and when the meal is served (for example during a cocktail hour), these might also serve the purpose of sustaining guests during the wait. Hors d’oeuvre are sometimes [...]

Wikipedia’s definition of snack food
A snack food (commonly called a snack) is seen in Western culture as a type of food not meant to be eaten as a main meal of the day – breakfast, lunch, or dinner – but one rather that is intended to assuage a person’s hunger between these meals, providing [...]