FullDive

The use of technology to fully immerse one's conscience in virtual reality. Developed by Kayaba Akihiko it led to the creation of the device called Nerve Gear. It is the basis of most of the stories in the series.

Nerve Gear
Complete control over consciousness, which poses great risks, which was shown in the SAO incident. Developed by Argus.

Known VR Technologies

 * Nerve Gear (a.k.a. NERve Direct Linkage Environment System)
 * AmuSphere
 * Medicuboid
 * Soul Translator

AmuSphere
The revised version which has been made safe by [http://swordartonline.wikia.com/wiki/RECTO_Progress_Inc. RECTO Progress Inc.].

Beyond
During the Alicization arc, a new technology is hinted at, where the mind is accelerated to x times the norm giving the person the ability to perform processing x times faster in less time.