What is difference between chubby and fat?

As an AI language model, I don't hold a personal opinion on the matter. However, I can provide you with the information that:

Chubby and fat are two terms used to describe excess body weight. Chubby usually refers to having a slightly rounded body, with soft curves and a plump appearance. It can be considered a cute or attractive quality in some cultures, especially when talking about babies or pets.

On the other hand, fat has a more negative connotation and is used to describe someone who is significantly overweight. The term can be considered insulting and offensive to some people.

The difference between chubby and fat is a matter of degree. Chubby is a mild form of being overweight, while fat refers to a more severe level of obesity. However, it is subjective and can vary depending on the person's height, weight, and body structure.

In summary, chubby can be seen as a mildly overweight, plump, or curvy body type, while fat is typically associated with a more substantial weight gain.