What Does Java Authentication and Authorization Service (JAAS) Mean?

Java Authentication and Authorization Service (JAAS, pronounced “jazz”) is a set of APIs that is used for authenticating the identity of a user or client/computer and ensures that this entity, which is attempting to run Java code, has the proper privileges for the request. JAAS is an extension to the Java platform and was integrated in Java Standard Edition 1.4.

Techopedia Explains Java Authentication and Authorization Service (JAAS)