An extremist is someone who holds radical views or beliefs that are far outside the mainstream. These individuals often advocate for significant changes in society, politics, or religion, and may resort to extreme actions to achieve their goals. Extremism can be found in various ideologies, including political extremism, religious extremism, and environmental extremism. Extremists may belong to organized groups or act independently, and their actions can range from peaceful protests to violent acts. The term is often associated with individuals or groups that reject compromise and seek to impose their beliefs on others, sometimes leading to conflict or social unrest.