Communicative capability is an obviously essential innate property of all social species. Humans and other social mammals typically use two communication systems:

The first is an intimate system that two individuals use to establish and maintain their relationship. Touch dominates, but it uses all sensory modalities. It's called grooming in primates, but no equivalent single word exists for humans that covers everything from social dancing to a handshake to a military salute to a caress to a pat on the back to a swat on the rear…

The second is a signal system that uses a set of sounds to alert others to specific group dangers and opportunities. Primate signal systems are holistic in that a single cry communicates the nature and location of the challenge. It's innate in that an infant monkey who hadn't previously heard a specific signal (such as for danger above) will still respond appropriately (by looking up).