This is another term you might have seen pretty much everywhere, but you don’t actually know what if is referring to. Dolby Digital is a laboratory that began compressing audio files in the early 1990’s. In fact, one of the very first movies to utilize this type of tech was the movie Batman Begins in 1992. Today, it has become a staple of how sound is compressed for almost all media. Since the original Dolby Digital, there are few more similar technologies that are used to transmit sounds, such as Dolby Digital EX, Dolby Digital Surround EX, Dolby Digital Live, Dolby Digital Plus, Dolby AC-4, and Dolby TrueHD- which is used for most Blu-ray DVDs.