The phrase "you deserve the world" is a way of expressing deep admiration, love, or appreciation for someone. When someone says this to another person, they are conveying the idea that the person being addressed is so special, kind, or deserving that they should have everything good and positive in life, as if they were entitled to the entire world.
The phrase is often used to emphasize how much someone values and cares for the other person. It can be said in various contexts, such as romantic relationships, friendships, or even in a parent-child relationship, to express a strong sense of affection and support.
While it's a heartfelt and well-intentioned sentiment, it's important to remember that no one can actually give someone the entire world. Instead, it serves as a powerful way to communicate how significant and deserving the person is in the speaker's eyes. It conveys a desire to provide the best possible experiences and happiness to the person they are addressing.