1080p HD: These are high-quality trailers with a resolution of 1920x1080 pixels.
720p HD: These are slightly lower-quality trailers with a resolution of 1280x720 pixels.
Some movie trailers may also be available in 4K resolution (3840x2160 pixels), but this is not as common. The availability of different resolutions may vary depending on the movie studio and the platform where the trailer is being released.