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What are the five main concepts of basic knowledge about volunteering?

Volunteer service is a service activity based on altruistic motives, voluntarily and free of charge, donating knowledge, physical fitness, labor, experience, skills and time, etc., to enhance the welfare of others, enhance personal value, and promote social harmony and progress.

Basic concepts of volunteer service

I am for everyone, everyone is for me, trust each other, and depend on each other

The five concepts are: 1. Volunteer service 2. Public welfare 3. Public welfare activities 4. Charity 5. Charitable institutions