Bourgeoisie. The term bourgeoisie is widely used in many non-English speaking countries as an approximate equivalent of upper class under capitalism.
Marxism defines the bourgeoisie as the social class which owns the means of production in a capitalist society. Marxism sees the proletariat (wage labourers) and bourgeoisie as directly waging an ongoing class struggle, in that capitalists exploit workers and workers try to resist exploitation. This exploitation takes place as follows: the workers, who own no means of production of their own, must seek employment in order to make a living. They get hired by a capitalist and work for him, producing some sort of goods or services.