Vegetarian: a diet of foods derived from plants, with or without dairy products, eggs and/or honey.
Vegan: excludes any use of any animal products for any purpose, including animal flesh (meat, poultry, fish and seafood), animal products (eggs, dairy, honey); the wearing and use of animal products (leather, silk, wool, lanolin, gelatin); also excludes animal use in entertainment, sport, research etc.
Ovo-Lacto Vegetarian: eats plant food plus eggs and milk products. Common in the West.
Lacto-Vegetarian: eats plant foods and milk products. Common in India.
Read more at: https://ivu.org/definitions.html