Cilantro and coriander are two common plants in the umbelliferae family, and I think they differ in appearance, aroma and uses.

Cilantro has thicker, dark green leaves with a strong aroma and is commonly used for flavoring or making spices.

Coriander has thinner, lighter green leaves with a lighter aroma and is mostly used in cooking to enhance flavors or to make gazpacho.

Cilantro has longer stems that require higher growing conditions, while coriander has shorter stems that require lower growing conditions.