Verbal communication involves the transfer of messages through spoken or written words. It can be oral, such as conversations or speeches, or written, as in letters, memos, and charts. Effective verbal communication is brief, concise, uses simple language, and polite words. Non-verbal communication conveys unspoken messages through gestures, body language, and other wordless signals. It accompanies all speaking and writing. The key difference between verbal and non-verbal communication is that verbal involves voice while non-verbal relies on body signs.