What is the purpose of the <source> element within media content?

• A. To define the caption text
• B. To embed images
• C. To link external CSS
• D. To provide alternative formats for the media

Answer: (D)

The main idea is that the element inside media content provides alternative formats of the same media so the browser can choose one it supports. Each source specifies a different file and its type, and the browser will try them in order until it finds a playable format. This makes playback more reliable across different browsers and devices, since not every browser supports every codec or container. For example, you might offer a MP4 version and a WebM version, and the browser will pick the first one it can play. If captions are needed, they’re added with a separate track element, not by the source element. Likewise, images use an img tag and CSS is linked with a link tag. Example: .