What is capitalism system?
Capitalism is the social system which now exists in all countries of the world. Under this system, the means for producing and distributing goods (the land, factories, technology, transport system etc) are owned by a small minority of people. We refer to this group of people as the capitalist class. The majority of people must sell their ability to work in return for a wage or salary (who we refer to as the working class.
The working class are paid to produce goods and services which are then sold for a profit. The profit is gained by the capitalist class because they can make more money selling what we have produced than we cost to buy on the labour market. In this sense, the working class are exploited by the capitalist class. The capitalists live off the profits they obtain from exploiting the working class whilst reinvesting some of their profits for the further accumulation of wealth.
In capitalism, the motive for producing goods and services is to sell them for a profit, not to satisfy people's needs. The products of capitalist production have to find a buyer, of course, but this is only incidental to the main aim of making a profit, of ending up with more money than was originally invested. This is not a theory that we have thought up but a fact you can easily confirm for yourself by reading the financial press. Production is started not by what consumers are prepared to pay for to satisfy their needs but by what the capitalists calculate can be sold at a profit. Those goods may satisfy human needs but those needs will not be met if people do not have sufficient money.