Capitalism is an economic system where private individuals and businesses, rather than the state, have control over trade, industry, and profits. It is based on the philosophy of laissez-faire, where the government does not intervene in private business as long as equal rights are respected. Adam Smith was a key advocate for capitalism and argued in his book The Wealth of Nations that self-interest and competition can lead to economic prosperity. While capitalism can be successful if citizens make good choices, it also has disadvantages like economic inequality, greed, unfair advantages, exploitation of labor, and monopoly behavior.