A plant in the cumin and coriander family. Used primarily in Caribbean, Mexican, and Asian food. Looks like parsley.
Most people hate it as it tastes like rotting soap mixed with burnt hair and metal.
Waitress: What can I get for you today?
Customer: Can I get the number 9, but without cilantro PLEASE! Please I HATE CILANTRO. IT'S DISGUSTING. OH MY GOD, PLEASE DON'T FORGET, NO CILANTRO! SH*T TASTES LIKE MOLDY DISH RAG WITH METAL SPRINKLES. IF IT'S IN MY FOOD I WILL KILL MYSELF.
Waitress: Alrighty, so no cilantro then.