Stegnography is defined as the art of hiding information, data or messages in an image. Even the different file formats can be used for the purpose of hiding the information like for example the video or audio etc. The purpose is to pass on the information with out any regard or knowledge of others safely to the destination. The advantage of stegnography is that those who are outside the party even do not realize that some sort of communication is being done.
I think no same meaning , only spellings are different.
The output of audio steganography is typically a modified audio file that contains hidden information embedded within its sound data. This hidden data can be anything from text messages to binary files, which are concealed in a way that is imperceptible to the human ear. The original audio quality remains largely intact, allowing the altered file to sound the same as the original. To retrieve the hidden information, specific algorithms or extraction methods are used.