The definition of audio is sound within the acoustic range which humans are able to hear. Audio can range from music playing at a rave, to the sound of water dripping out a tap. But you’re obviously not going to use the sound of water dripping in your presentations. Thought what you can use is a narration of the text in your presentations or special sound effects to complement certain images you have included on your presentation. 
Introduction to Audio & Video
Hi everyone,
This is my first post on my blog and I would like to give you all a brief overview of what you can expect from it. My blog is based on the use of audio and video in presentations and how it’s use will effect you, either in a beneficial or non-beneficial way. I hope you find my blog useful
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Audio & Video in Presentations 