YouTube allows you to create closed captioning for videos. Those captions can be created using an industry standard SRT file that contains text and timing information. These are time consuming to create.
You can also use a plain text file an have YouTube automatically time the captions. YouTube's auto-timing doesn't just flash text on the screen at a timed interval. It attempts to match the words with the text and time them to appear when they are actually said.
Close captioning your videos expands your audience. It makes the videos more accessible for those with hearing disabilities. It helps viewers understand the content when the audio is a little garbled. Close captioned videos are also machine-translated into over 40 supported languages.
