Web accessibility refers to how easily people with disabilities can navigate and interact with websites. Disabilities may be physical (such as blindness, low vision, deafness, or fine motor skills difficulty), or cognitive (such as dyslexia or attention deficit disorder). People with disabilities often use assistive technologies to help them navigate the web. An assistive technology is any device that helps a person with a disability. Common web assistive technologies include modified mice and keyboards, screen readers and screen magnifiers.