What is the file extension commonly associated with video files?

The file extension most commonly associated with video files when considering general usage and compatibility across various platforms and devices is .mp4. This is because .mp4 files utilize a highly efficient codec, known as H.264, which compresses video data without significantly sacrificing quality. This makes .mp4 files particularly well-suited for online streaming, sharing, and playback on a wide range of devices, including smartphones, tablets, and computers.

Furthermore, the .mp4 format supports a variety of multimedia content, including audio and subtitles, which enhances its versatility. The widespread adoption of .mp4 across different media applications and its compatibility with most players make it a standard choice for both consumers and professionals in the audio-visual field.

While .avi, .mov, and .wmv formats are still used, their limitations in terms of compression, platform compatibility, and file size often make .mp4 a more favorable option for contemporary video usage.