Money is important to live, and to earn that money people need to work.
This is one of the main reasons for working but, I believe that,---no comma here.-- money is not everything, as we cannot buy happiness with it.
There are many other reasons for working such as to gain experience, volunteering, to help others, and for physical and mental exercise which give satisfaction to people.
The first reason to work is to gain an experience.
Some students do part time work while studying.
That was very useful because whatever I was learning in college, was the same thing I was practicing at my job.
The second reason is that some people like to do social services such as volunteering.
Many people do volunteering work in libraries or in the community.
We can see many old age people doing such work for the sake of satisfaction and not for money.
Not only are older people doing these works but youngsters do also.
They cannot sit idle.
There are many reasons for working other than earning money, such as helping others, gaining experience, volunteering and the like, which gives people a happiness and satisfaction.