If you are deaf or hard of hearing, there are several accessibility features available to you.
A caption is transcript for the audio track of a video presentation that is synchronized with the video and audio tracks. Captions are generally rendered visually by being superimposed over the video, which benefits people who are deaf and hard-of-hearing, and anyone who cannot hear the audio (e.g., when in a crowded room). Learn how to turn captioning on and off in YouTube.
Your computer, tablet, or mobile device has volume control features. Each video and audio service has its own additional volume controls. Try adjusting both your device’s volume controls and your media players’ volume controls to optimize your listening experience.