Some clients want “red book specs” and dry recordings (just your voice; no music or sound effects). Red book specs are standard for CD-quality audio files: 2 channel, 44k, 16 bit. Although you can record good audio at red book specs, you can generally record cleaner audio at 24 bit and then adjust the sampling to the client’s specifications.
The Internet is full of resources for quick definitions among other things. When in doubt, I click over to Wikipedia, an ever-growing wiki site full of articles on everything. It’s community operated and created through online collaboration. Like everything we encounter on the Internet, wiki articles have to be evaluated, not taken as gospel; but I’ve found it to be a reliable resource for most searches I’ve run over there.
Wikipedia has this article on the Red Book audio standard. Short and sweet. If you don’t find it on Wiki, there’s always Google.
