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Accessibility is a general term used to describe the degree to which a system is usable by as many people as possible. In other words, it is the degree of ease with which it is possible to reach a certain location from other locations. It is not to be confused with usability which is used to describe how easily an entity (e.g., device, service, environment) can be used by any type of user. Accessibility can also be viewed as the "ability to access" the functionality, and possible benefit, of some system or entity; such a definition brings in access-based individual rights laws and regulations that are discussed below. One meaning of accessibility specifically focuses on people with disabilities and their right of access to entities, often through use of assistive devices such as screen-reading web browsers or wheelchairs. Other meanings are discussed below.