Communication is a process of exchanging information between a sender and receiver. It involves verbal and non-verbal messages and is effective when it elicits a desired response or feedback. The key components of communication are the sender, receiver, message, medium, context, and feedback. Verbal communication includes oral and written communication while non-verbal communication conveys messages through body language, eye contact, and other means without words. Effective communication depends on selecting the appropriate medium and considering the context to ensure the message is clearly received and understood.