Digital audio is a bunch of number values that are used to interpret sound waves at different points in time. The value is digitized, with digital audio you can copy the numeric values over and over again without ever losing any quality. With analog data you cannot copy it over and over again without losing quality, to prevent that from happening there is a software called CODEC. It codes and decodes analog data and digital audio. First it takes the analog sound and coverts its to a series of numbers which is digital audio, then it decodes it and takes the digital information and converts it back to analog audio, which you are then able to listen to. In order to play the audio back you have to have the same CODEC software which was used in the first place. Compression is another concept to multimedia audio. For multimedia audio you use a lossy compression type, which sacrifices file quality for the sake of compression, but can sound just as good to the human ear as the uncompressed version, but at a 7th or 10th of the size. With compression you run into two options quality vs size. Typically, with music you want higher quality and less compression, but if it is simply a voice you can have much more compression without losing much quality.
Creating your own Audio:
In order to create your own audio you have to have some type of hardware to capture the audio and then a software program. The audio hardware used is microphones and audio adapters, this hardware gets attached to a line-in, mic jack, or USB port, which are all found on most every PC or laptop. The software used can be downloaded for free, or if more advanced software is required you can purchase it.
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