Lacto-vegetarianism is a diet where people don't eat meat but they still have dairy products like milk and cheese. Think of it like a superhero who doesn't eat bad guys (meat) but still likes to drink milk and eat cheese to stay strong and healthy. So, a lacto-vegetarian can have things like mac and cheese, yogurt, and ice cream but no hamburgers or chicken nuggets. Basically, they choose to not eat meat but still enjoy some yummy dairy products.