Whole world think that India has many castes which are main reason of discrimination of people but its very very big misconception of caste system spread around the world to defame culture of India because it was the biggest systematically designed system for people from thousands of years. Now let me tell you what is meaning of varna and caste system in India and how its was started.
In Ancient India there were two great saints, one was saint Bhrigu and other was saint Bhardwaj. They met to discuss how to structure a stable society for human being to live proper life, First they recognised the four sources which are
They decided to make system where nobody has more than one of that. These should not be in one hand, not even two should be in one hand. So those who has knowledge will not have wealth, will not have weapons and will not have lands. Those who will have weapons will rule the country but they will not make policy. They need to go to people having knowledge to seek their permission and advice. Those who are having wealth, their social status will be decided by the how much philanthropy they do not by their wealth. Those who has lands have to produce for the society. In fact none of these four category or “varna” was based on by birth.
Read more at Misconception of Caste System and Brahmin Supremacy in Hinduism – Global Hinduism.