It might come as a surprise, but coriander and cilantro are the same things. Americans know coriander leaves as cilantro, the Spanish name for the plant, because of its extensive use in Mexican cuisine. Despite how common it is in Mexican food, the plant is native to southern Europe, northern Africa and southwestern Asia.
When referring to the fruits of the plant we say coriander seed. The coriander found on the spice shelf are these seeds, dried and ground. Who knew? The coriander in your cabinet and the cilantro in your fridge come from the same plant.