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Caption can also be found on television. In this case, captions are text versions of the spoken word presented within multimedia. Captions allow the content of web audio and video to be accessible to those who do not have access to audio. Though captioning is primarily intended for those who cannot hear the audio, it has also been found to help those that can hear audio content, those who may not be fluent in the language in which the audio is presented, those for whom the language spoken is not their primary language, etc. Captions can be either closed or open. Closed captions can be turned on or off, whereas open captions are always visible. Closed captions for television are very limited in their formatting because the caption look, feel, and location are determined by the caption decoder built into the television set. Open captions are similar to, and include the same text, as closed captions, but the captions are a permanent part of the video picture, and cannot typically be turned off. 

"..., it has also been found to help those that can hear audio content, ...." The word it refers to____.