To volunteer means to offer one's time and services willingly and without payment for a cause or organization, typically for the benefit of others or the community. 

Requiring students to volunteer for 100 hours during their high school career serves multiple purposes: 

Community Engagement: Volunteering allows students to become actively involved in their communities, fostering a sense of responsibility and citizenship.

Skill Development: Volunteering provides opportunities for students to develop various skills such as communication, leadership, teamwork, and problem-solving.

Character Building: Engaging in volunteer work can help students develop empathy, compassion, and a sense of social responsibility.

College and Career Readiness: Many colleges and universities value volunteer experience on student applications, considering it as evidence of character, commitment, and service orientation. Additionally, volunteer experience can provide valuable insights and skills relevant to future careers.