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AAC is a popular audio format (MP4 videos may actually use AAC for its audio part). It uses lossy compression which remove sounds at low frequency that cannot be heard by human. Therefore the file is smaller than MP3 and still have good quality.
AIFF (Audio Interchange File Format) is a loseless storage audio format developed by Apple Inc. This one is widely used by Apple MacOS similar to how WAV is popular on Windows.
OGG is an open container audio format created by Xiph.org foundation. Free, open and unrestricted, it's excellent for streaming and editing. OGG is usually lossy compressed and have higher quality than MP3 of the same size. Loesless counterpart of OGG is usually addressed as FLAC.
WAV (Waveform Audio File Format) is a loseless storage audio format developed by Microsoft and IBM. This one is widely used by Windows similar to how AIFF is popular on MacOS.
WebM can either be a video or audio format. It is royalty-free and popular as web media arises. All modern browsers support playing WebM which is perfect for websites. It is actually a profile of Mastroka (MKV).
AVI (Audio Video Interleaved) is a video format created by Microsoft for Windows. AVI can support multiple channels of audios and videos like DVD. It becomes popular as Microsoft Windows supports it natively. The format supports compression but not very effectively.
FLV (Flash Video) is a video format created by Adobe for Adobe Flash Player. It was intended to deliver video contents over the Internet. It can also be embedded within SWF files. As Flash Player is being retired, FLV format is also seeing its decline as standard web format like WebM rises.
GIF (Graphics Interchange Format) is actually an image format instead of video as it does not support audio. It has become popular due to being supported by all web browsers for animated images. The size is a bit concerning as it uses loseless compression and only supports a certain number of colors per frame.
MOV (QuickTime File Format) is a video format used by Apple QuickTime. It can compress both audios and videos. Although developed by Apple, it has Windows support as well although Apple ceased support for Windows QuickTime in 2016.
MP4, also called MPEG-4 Part 14 is very popular format for storing videos and audios. Its format allow for streaming videos effectively so you can watch the video without having downloaded the whole file. It also supports both lossy and loseless compression.
MKV (Matroska Multimedia Container) is a free and open-standard media format for containing audios and videos. It can also contains pictures, subtitles within one file. Famous for being open and also supported by open-source software community, you can view and edit the file on any OS because there is supported softwares for any of them.