A garden fork is a tool with several sturdy tines used for digging, turning over soil, and lifting plants or debris in the garden. On the other hand, a garden cultivator is a tool with multiple prongs or tines that are used to break up and aerate soil, as well as to remove weeds and cultivate the soil before planting. In summary, a garden fork is primarily used for digging and lifting, while a garden cultivator is used for breaking up.