1) Educational technology refers to using physical hardware, software, and educational theories to facilitate learning and improve performance. 2) Communication is the process of sharing knowledge, experiences, feelings, and thoughts with others through speaking, writing, gestures, touch, or broadcasting. Effective communication is important for expressing information and understanding others. 3) There are four main types of communication: verbal, non-verbal, written, and visual. Verbal communication involves speaking, non-verbal uses body language and facial expressions, written relies on writing, and visual utilizes images, charts, and graphs. Barriers to communication include physical and emotional factors.