You is a single person being addressed. When you talk about yourself you usually say I or me. When you talk about someone else and you are talking to them, you say you. For example, you are reading this page.
Yuck is a sound you make when you think something is disgusting. Children often say yuck about food they don't like to eat.
Yum, or yummy, is a sound you make when you really enjoy your food.
Yummy is also an adjective that children use to describe really delicious food.














