1) Language is an abstract system of symbols and meanings that includes rules for relating symbols and meanings to allow communication. It is a key feature that distinguishes humans from other animals.
2) Language is organized through processes like remembrance and utilization of limited words and infinite sentences. It involves meaningful, arbitrary symbols linked to concepts through sound.
3) Communication requires at least a transmitter, signal, channel, and receiver. It can be verbal using language or nonverbal using cues like paralanguage, proxemics, and body language. While language is important for human communication, some communication is still possible without it through other signals.