In the digital audio world, the second half of the '90s and a notable portion of the '00s were dominated by the "codec wars." Kicked off by MP3, which emerged in mid-1994, the battle was soon joined by a host of competitors; industry-standard follow-on AAC, Microsoft-developed WMA, RealNetworks-championed RealAudio, open-source favorite Ogg Vorbis, etc. And, from a surround sound standpoint, Dolby Digital was dominant in the DVD era, with DTS ascendant on the Blu-ray successor.