Final answer:
An emoticon is a group of characters that expresses an emotion, commonly used in digital communication.
Step-by-step explanation:
A group of characters that expresses an emotion is called an emoticon. Emoticons are commonly used in digital communication, such as text messages, emails, and social media, to convey emotions or tone. They are typically created using a combination of keyboard characters, such as punctuation marks, letters, and numbers, and are intended to visually represent a specific emotion or facial expression.