All components of an information system to be authorized for operation by an authorizing official and excludes separately authorized systems, to which the information system is connected.
Source(s):
NIST SP 800-137 under Authorization Boundary from NIST SP 800-37
NIST SP 800-161 under Authorization Boundary from NIST SP 800-53 Rev. 4
NIST SP 800-30 Rev. 1 under Authorization Boundary from CNSSI 4009
NIST SP 800-37 Rev. 1 under Authorization Boundary
NIST SP 800-39 under Authorization Boundary from NIST SP 800-37
NIST SP 800-53 Rev. 4 under Authorization Boundary
NIST SP 800-53A Rev. 4 under Authorization Boundary from NIST SP 800-37

  A discrete, identifiable information technology asset (e.g., hardware, software, firmware) that represents a building block of an information system. Information system components include commercial information technology products.
Source(s):
CNSSI 4009-2015 from NIST SP 800-53 Rev. 4
NIST SP 800-53 Rev. 4 under Information System Component from NIST SP 800-128 - Adapted

  A software object, meant to interact with other components, encapsulating certain functionality or a set of functionalities. A component has a clearly defined interface and conforms to a prescribed behavior common to all components within an architecture.
Source(s):
NIST SP 800-95 under Component from Web Services Glossary - W3C Working Group Note 11 February 2004

  A discrete identifiable IT asset that represents a building block of an information system.
Source(s):
NIST SP 800-128 under Information System Component
NIST SP 800-128

  A system, component, application, etc., that is based upon technology which is used to electronically process, store, or transmit information.
Source(s):
NIST SP 800-128 under Information Technology Product

  Any hardware, software, and/or firmware required to construct a CKMS.
Source(s):
NIST SP 800-152 under Component

  An element such as a fingerprint capture station or card reader used by an issuer, for which [FIPS 201-2] has defined specific requirements.
Source(s):
NIST SP 800-79-2 under Component

  See system component.
Source(s):
NIST SP 800-128 under information technology product
NIST SP 800-37 Rev. 2 under information technology product
NIST SP 800-53 Rev. 5 under information technology product

  See Authorization Boundary.
Source(s):
NIST SP 800-53 Rev. 4 under Information System Component from NIST SP 800-128 - Adapted

  See information system component.
Source(s):
CNSSI 4009-2015 under information technology product
NIST SP 800-128 under Component
NIST SP 800-53 Rev. 4 under Information Technology Product

  An entity with discrete structure, such as an assembly or software module, within a system considered at a particular level of analysis. Component refers to a part of a whole, such as a component of a software product, a component of a software identification tag, etc.
Source(s):
NISTIR 7695 under Component from ISO/IEC 19770-2 - Adapted

  A hardware, software, firmware part or element of a larger PNT system with well-defined inputs and outputs and a specific function.
Source(s):
NISTIR 8323 under Component from NIST SP 800-160 Vol. 1 - Adapted, DHS RCF - Adapted

  An element of a large system, such as an identity card, PIV Issuer, PIV Registrar, card reader, or identity verification support, within the PIV system.
Source(s):
FIPS 201 [version unknown] under Component