The document provides an overview of key concepts related to language and communication. It defines language as a system with grammar, phonology, and lexicon that allows a community to communicate. Communication is defined as a two-way process of exchanging information through symbols between individuals. The key elements of communication are the sender, message, receiver, feedback, context, and barriers like noise. Communication can occur through verbal means using words or nonverbally through signs and symbols. Effective listening skills are also important for communication.