![4girls akebono_(kantai_collection) animated bad_link bell blue_eyes blue_hair brown_eyes chibi couch cushion eating failure_penguin flower frown hair_bell hair_flower hair_ornament indoors jingle_bell jukebox kantai_collection long_hair looking_at_viewer looking_away miss_cloud mp4 multiple_girls oboro_(kantai_collection) pink_eyes pink_hair pori_(poritan81) purple_eyes purple_hair sazanami_(kantai_collection) short_twintails side_ponytail sitting twintails ushio_(kantai_collection) rating:s score:8 4girls akebono_(kantai_collection) animated bad_link bell blue_eyes blue_hair brown_eyes chibi couch cushion eating failure_penguin flower frown hair_bell hair_flower hair_ornament indoors jingle_bell jukebox kantai_collection long_hair looking_at_viewer looking_away miss_cloud mp4 multiple_girls oboro_(kantai_collection) pink_eyes pink_hair pori_(poritan81) purple_eyes purple_hair sazanami_(kantai_collection) short_twintails side_ponytail sitting twintails ushio_(kantai_collection)](/cdn_image/preview/47/74/4774e2e3a2782288e338b0ef75636b72.jpg)
MPEG-4 Part 14 or MP4 is a multi-purpose container format based on Apple's QuickTime format. It is an ISO standard (ISO/IEC 14496-14). It can be used for audio as well as video. It is mostly used to contain H.264 (MPEG-4 Part 10) compressed video with/and/or AAC (Advanced Audio Coding) or MP3 compressed audio. Modern browsers can directly stream MP4 files.
H.264 is the most used video format for video streaming while AAC is the successor to MP3, being more efficient than its predecessor. MP3 is still by far the most used audio format.
This tag implicates animated (learn more).