Body language is communication without words. It is anything someone does to which someone else assigns meaning. Not all of the "signals" a person sends are intentional and often they are "not picked up" or misinterpreted. Nonverbal behavior is complex, subtle, and multichannel. It may be structured (following certain rules) but is more likely to be unstructured; it may be continuous, unlike language, which comes in disconnected units; it may be learnt but some functions seem innate; and it may be "right-" as opposed to "left-brained.