When an individual is reserved and likes to remain him or herself, then that person is referred to as an introvert and when a person is talkative, social, and make friends easily, then that type of personality is called an extrovert. According to science, the brains of introverted and extroverted people are different. If you are an introverted person and wondering why an extrovert person is different from you, then you need to remember that his or her brain is different from you.