Assistive Technology (AT) is defined as "any item, piece of equipment, or product system, whether acquired commercially off the shelf, modified or customized, that is used to increase, maintain or improve functional capabilities of a student with a disability."
Individuals With Disabilities Educational Act (IDEA) 2014
In plain language, AT assists students with disabilities to increase their overall capacity to work, accomplish specific tasks or participate in activities that otherwise would be difficult or impossible.