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Wikipedia goes into more detail - the site has its many issues, but their 'socialism' article is alright.
In a few words: capitalism results in the economy being controlled by people who own businesses and shares as their main source of income (the owning class, the bourgeoisie ), they own the tools that their employees use, but instead, the people who actually perform work for a living (the proletariat ) need to own the tools which we use...