A Zone in the Umbra where mages have crafted a computer network world. Notions of computers & the Internet heavily influence this odd space.
Digital Web may be Mount Qaf, a naturally occurring realm between Middle and High Umbras. Could also be a Zone wedged inside the Gauntlet.
White Wednesday/Great Crash happened on Nov.10, 1997. Much destruction but people rebuilt afterwards. Doissetep's destruction caused it. The Sphinx in the "Matterhorn" that guards the largest library ever.
Mt. Qaf is important to Ahl-i-Batin. Mentioned pg. 28 Infinite Tapestry. Some think it is the same thing as the Alder Bole, a great tree that connects all parts of the Umbra. Not only could it be used to get from any point in the Umbra to any other but could lead to mystic insights that aid Ascension.
Pg. 60 Operatives Dossier has notes on needing skill checks to move between sectors in the Digital Web. This book adds Augmented Reality. This book states the Digital Web is +1 for Correspondence, Forces, Prime. Mages who know those Spheres can use them at 1 level higher than their ability in that Sphere, maximum 5.