Coriander seed, which are actually the dried fruit of the coriander plant, is used as a spice. Typically used ground, coriander seed has a spicy, citrus flavor. Coriander seed is used extensively in Indian, Middle Eastern and Asian cuisines. Whole coriander seed is sometimes used in pickling and brining.
Coriander powder is derived from the seeds of the coriander plant. It adds a mild flavour and aroma to sweet and savoury food preparations. Most commonly, it is bought as whole dried seeds and ground as and when needed, but it can also be found as a readymade powder.