Answer:
The emotion :) is commonly used to represent a smiling face. It is a simple way to convey a positive or happy emotion in written communication, such as text messages, emails, or online chats. The colon (:) represents the eyes, and the parenthesis ) represents the mouth, forming a sideways representation of a smiling face. The use of emoticons helps add a tone of friendliness or positivity to a message, especially when the nuances of facial expressions and tone of voice may be absent in written text.
Another example is the emotion :D which represents a big, wide smile.
:)