No. This is the most common confusion. They come from the same plant, but 'Coriander' (this product) is the ground, dried *seed*, which has a warm, citrusy, and earthy flavour. 'Cilantro' (or 'fresh coriander') is the pungent, soapy-tasting *leaf*. They are not interchangeable.
Ground Coriander has a lovely, complex flavour. It is warm, earthy, floral, and has a distinct bright, citrusy note (like lemon or orange peel). It is a mild 'warming' spice, not a 'hot' spice.
They are partners, not substitutes. Coriander is warm, light, and citrusy (an 'upper' note). Cumin is deep, smoky, savoury, and musky (a 'bass' note). Most curries and taco seasonings use both to create a balanced flavour.
It is a foundational spice. It's the base for most curry powders, spice rubs, and marinades. For best results, 'bloom' it by frying it in hot oil for 30-60 seconds at the start of your dish to release its full flavour.
There is no perfect substitute. In a pinch, you could use a small amount of caraway (more peppery) or ground fennel (sweeter). If you're missing it from a curry, a better option is to add a bit more cumin and turmeric.
