This document discusses oral communication skills and oral defenses. It defines communication and outlines the types, including oral and written. Oral communication refers to verbally transmitting information or ideas to individuals or groups for understanding. Formal oral communication includes presentations, lectures, and interviews, while informal includes conversations and meetings. Barriers to effective oral communication include a lack of focus, confidence, and clear messaging, as well as biases. These barriers can be overcome with skills like active listening, choosing an appropriate channel, and being patient and specific. Limitations of oral communication include issues with distance, message length, retention, tone, and potential for misunderstandings.