An outsider is someone who does not belong to a particular group or society, either by choice or circumstance. They are often seen as different from those on the inside and may experience social exclusion or marginalization due to their status as an outsider. The term can also refer to someone who is new to a certain situation or environment, such as a new employee at a company or a visitor in a foreign country. In short, being an outsider means standing apart from the norms and expectations of a particular group or culture.