Why does the captioning related to video services?

Captioning services are of basically Comprised of showing text counterparts of the words being said and spoken. Some television programs, online videos, and educational training tools are mostly in need of captioning services . And there are various methods where captions can be displayed on the screen. Example, in broadcast captioning services , the captions are laid out at the bottom part of the video. Mostly, this type of open captioning services is colored for the purpose of indicating the speaker. These can be a contributing factor did can generate rally affect the captioning rates .