If you ever met someone and just could tell if they are extrovert or introvert, what behavior, sign, or body language made you think that? What do you think about being an extrovert or an introvert, and what do you consider as the biggest impact on someone's life that can change their behavior and way of thinking?
An extrovert, normally talks a lot, you will notice him and hear him. He will be one of those chatting the most.
An introvert will be standing and listening as a bystander, he will answer qustions but normally not ask a lot.