What is Video
Video is an electronic medium for the recording,and display of moving visual media.
What is Sound
Sound is a vibration and sends waves of energy (vibration) into our ears. The vibrations travel through the air or another medium (solid, liquid or gas) to the ear. The stronger the vibrations, the louder the sound. .
What is Speaker
Speaker are one of the most common output devices used with computer systems and also use to another device linke TV, CD, etc.