The Remote Authentication Dial In User Service (RADIUS) protocol
defines a standard for information exchange between a network device
or software application and an authentication, authorization, and
accounting (AAA) server to manage and track user access to network
services.
A RADIUS AAA server provides authentication (verifying user
credentials), authorization (supplying provisioning information for
the user), and accounting (storage of usage information into accounting
logs) services to devices and software applications (AAA clients)
that support the IETF RADIUS standards.
The AAA or RADIUS client is the access device or application
that acts as an enforcement point to control access to a resource.
The user device itself or application requesting access to the resource
is referred to as the supplicant.
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