In a feudal government, the laws are created by the wealthy landowners with complete control over how the people should live. The peasants have little say in how things should be run, and few options to leave.

In a capitalist society, corporations are owned and operated by the wealthy, and they have complete control over the people at their jobs (and often outside it, too). The workers have little say in how things should be run, and cannot leave without fear of losing necessities like healthcare.

Democracy gives the people a say in how their government should be run. Socialism gives the workers a say in how their company should be run. We've managed to no longer be exploited by our government (but not completely), but we still have to live with being exploited by the wealthy.

Democracy is to Feudalism as Socialism is to Capitalism.