Atheists are individuals who do not believe in the existence of any deities or gods. This perspective can stem from various reasons, including a reliance on scientific explanations for the universe and a lack of empirical evidence supporting religious claims. Atheism is often considered a philosophical stance rather than a formal belief system. Many atheists may identify with secular humanism, which emphasizes human values and ethics without reference to the divine. Atheism can vary in expression, with some atheists actively engaging in discussions about religion, while others may simply live their lives without religious affiliation or concern.