Sometimes closed captions and subtitles are easily confused because they have many similarities. Closed captions are encoded into a video signal and a decoder is required to view them; subtitles, however, are displayed without the need of a decoder. Subtitles are sometimes displayed always-on or in devices such as DVD, Blu-ray, or various web players they can be turned on/off.
Closed captions are always formatted for deaf and hard of hearing audiences, and include speaker identification and descriptions for non-verbal sounds. Subtitles are commonly formatted for either SDH (subtitles for the deaf and hard of hearing) or speakers of other languages. Because DVDs can accommodate many language options, sometimes both SDH and ESL subtitles are available in the same language. Additionally, pop-on closed captions have the ability to be positioned anywhere on the screen. This is very helpful for identifying speakers or to avoid covering graphics; most subtitles however, are limited in their screen positioning.