Volunteerism (noun)

1. The act or practice of volunteering one's time and services for a cause or organization.
2. The philosophy or belief in the value of volunteering.

Origin:

From the word "volunteer" meaning "one who offers to do something without being forced to do it".

Examples:

1. She became involved in volunteerism at a young age.
2. The community's volunteerism was vital to the success of the project.
3. Volunteerism is an important aspect of our society.
4. The volunteerism program helped to improve the lives of many.
5. She has a deep commitment to volunteerism.