Virtual training refers to training done in a simulated environment using augmented, virtual, or mixed reality technology to enable participants to conduct training remotely and to avoid the cost and complexity of training in situations such as evacuating a burning building or diagnosing a jet engine. Virtual training environments are designed to allow employees to perform actions and learn in simulated operational environments. Virtual training programs act as a repository of knowledge and best teaching practices accumulated over years. This allows standardized training delivery at scale. Virtual training also reduces costs associated with the labor of experienced trainers, allows more flexible training schedules so workers can accelerate the certification process, and avoids the cost and complexity of material setups.