There are cases that you would like to play AVCHD videos with QuickTime or edit the camcorder movies by using Final Cut Pro on Mac.
It is a form of video compression that allows the large data files created by HD video recording to be captured and saved on digital media such as hard disk drives and flash memory cards. AVCHD (Advanced Video Codec High Definition) is high definition camcorder video format jointly developed by Panasonic and Sony for use in consumer camcorders.