All the content on the site is embeddable, and there are multiple resolutions to choose from for downloads. The site also shows image metadata, so you can see what equipment was used when they were captured. There’s also a caption file available for all video, so you can easily include subtitles with clips when reposting.
NASA notes that this isn’t a comprehensive collection of its available media, but a representative and deep collection with an easy-to-access public interface. It’s also planning to expand this collection over time.