A power user or experienced user is a computer user who uses advanced features of computer hardware, operating systems, programs, or web sites which are not used by the average user. A power user may not have extensive technical knowledge of the systems they use and is not necessarily capable of computer programming and system administration, but is rather characterised by the competence to make the broadest or most general use of computer programs or systems. In enterprise software systems, "Power User" may be a formal role given to an individual who is not a programmer, but who is a specialist in business software. Often these are people who retain their normal user job role, but also function in testing, training, and first-tier support of the enterprise software. Users may erroneously label themselves as power users when they are less than fully competent.