the practice of abstaining from various groups of animal-based foods.

Vegetarianism is the practice of abstaining from various groups of animal-based foods.

Questions about vegetarianism are on-topic here, but only if the question is asking in the context of sustainability. Some vegetarians are motivated by concerns that current agricultural practices are unsustainable, especially with relation to industrial agriculture and animal agriculture.

Common examples of vegetarian lifestyles:

  • Lacto-ovo vegetarians consume milk and egg, but abstain from animal flesh. This is the most common variant of vegetarianism in Western countries.
  • Vegans abstain from all animal products, as much as is practicable.
  • Pescetarians consume fish and seafood, but abstain from the meat of land-going animals.

Questions of ethics and health are better addressed on the Stack Exchange site for vegetarianism.