If you've ever watched a video with text at the bottom of the screen, you've seen a **caption** in action. Captions convert audio into readable text, appearing on-screen in sync with the video. They include dialogue, speaker identification, and important sounds like \[door slams\] or \[music playing\].

Nearly 50% of US viewers watch videos with captions regularly. What started as an accessibility feature has become essential for everyone—from people watching in noisy environments to non-native speakers improving comprehension.

Image by [Monica Flores](https://unsplash.com/@monicadear) on Unsplash

## Captions vs Subtitles

People often confuse **captions** with **subtitles**, but they serve different purposes:

- **Captions** assume viewers cannot hear the audio. They include dialogue, sound effects \[phone rings\], music cues, and speaker identification.
- **Subtitles** assume viewers can hear but need translated dialogue. They typically don't include sound descriptions.

For example, captions might show "\[dramatic music\]" before a tense scene, while subtitles would only display the spoken words.

## Types of Captions

### Closed Captions (CC)

**Closed captions** can be turned on or off by viewers. They're the standard for streaming platforms, YouTube, and broadcast TV. Viewers can customize size, color, and position.

### Open Captions

**Open captions** are permanently embedded in the video—viewers cannot turn them off. They're ideal for social media videos and public displays where viewers can't access settings.

### Live Captions

**Live captions** are generated in real-time during broadcasts, events, or meetings. They use speech recognition technology to convert spoken words to text instantly. This is what [Stage Captions](/content/site-root.html) provides for conferences and live events.

## Why Captions Matter

### Accessibility

Captions make content accessible for deaf and hard of hearing viewers, people with auditory processing disorders, and those in noisy environments.

### Better Engagement

Many viewers watch videos with sound off—especially on mobile or in public. Captions ensure your message reaches them regardless of their audio situation.

### Improved Comprehension

Reading text while listening improves retention. This benefits language learners, educational content, and complex presentations.

### Legal Compliance

The ADA, Section 508, and WCAG guidelines require captions for many types of content. Broadcast television and streaming services must provide closed captioning.

## Key Takeaways

- A **caption** is text displaying all audio content—dialogue, sounds, and music—synchronized with video
- **Closed captions** can be toggled; **open captions** are permanent
- **Live captions** are generated in real-time for broadcasts and events
- Captions improve accessibility, engagement, and legal compliance