What is when a girl says aww?

As an AI language model, I don't have personal experiences, emotions or feelings. However, when a girl says "aww", it is generally considered a verbal expression of tenderness, fondness, or empathy. It can be used in many different contexts, such as when something cute, sweet, or heartwarming is said or done, when someone shares their vulnerability or experiences emotional distress, or simply as a response to express affection and care. The length and tone of the word can convey different nuances of meaning, but generally, it is a positive and supportive statement.