The “seeds” are actually dried fruits of the coriander plant and are referred to as Coriander Seed where as the fresh plant can be known as Coriander, cilantro and Chinese parsley.
Coriander also comes as a powder but loses it’s pungency quite quickly in this form.
the flavour of coriander seeds have a lemony citrus flavour when crushed, due to terpenes linalool and pinene. It is described as warm, nutty, spicy, and citrus flavoured.
The aroma varies slightly from variety to variety but the general consensus if woody and lemony
Coriander seeds are incredibly versatile but will be most commonly found in curry pastes and bbq rubs