A vegetarian diet focuses on plants for food. These include fruits, vegetables, dried beans and peas, grains, seeds and nuts. ... The vegan diet, which excludes all meat and animal products. The lacto vegetarian diet, which includes plant foods plus dairy products.
When people think about a vegetarian diet, they typically think about a diet that doesn't include meat, poultry or fish. But vegetarian diets vary in what foods they include and exclude:

Lacto-vegetarian diets exclude meat, fish, poultry and eggs, as well as foods that contain them. Dairy products, such as milk, cheese, yogurt and butter, are included.
Ovo-vegetarian diets exclude meat, poultry, seafood and dairy products, but allow eggs.
Lacto-ovo vegetarian diets exclude meat, fish and poultry, but allow dairy products and eggs.
Pescatarian diets exclude meat and poultry, dairy, and eggs, but allow fish.
Pollotarian diets exclude meat, dairy and fish, but allow poultry.
Vegan diets exclude meat, poultry, fish, eggs and dairy products — and foods that contain these products.