Slavery was a widely accepted practice in ancient Greece, as it was in contemporaneous societies. The principal use of slaves was in agriculture, but they were also used in stone quarries or mines, as domestic servants, or even as a public utility, as with the demosioi of Athens.
Modern historiographical practice distinguishes between chattel slavery slavery (where the slave was regarded as a piece of property, as opposed to a member of human society) and land-bonded groups such as the penestae of Thessaly or the Spartan helots, who were more like medieval serfs (an enhancement to real estate). The chattel slave is an individual deprived of liberty and forced to submit to an owner, who may buy, sell, or lease them like any other chattel.