helping others to achieve a common goal
Making your own contribution gives satisfaction from participating in something important and needed by other people. It gives an opportunity to leave something valuable behind. It positively influences self-esteem and life satisfaction.
Those who like to contribute are able to see value in the work of others. They have a lot of energy to act and help. They feel good in teamwork.
Beware of people and organizations trying to misuse the help you offer.