A discrete identifiable information technology asset that represents a building block of a system and may include hardware, software, and firmware.
Sources:
NIST SP 800-128
NIST SP 800-172 from NIST SP 800-128
NIST SP 800-172A from NIST SP 800-128
NIST SP 800-37 Rev. 2 from NIST SP 800-128
NIST SP 800-53 Rev. 5 from NIST SP 800-128
NIST SP 800-53A Rev. 5 from NIST SP 800-128
NIST SP 800-171 Rev. 2 from NIST SP 800-128

  See system component.
Sources:
NIST SP 800-128 under component
NIST SP 800-128 under information technology product
NIST SP 800-172 under component
NIST SP 800-37 Rev. 2 under component
NIST SP 800-37 Rev. 2 under information technology product
NIST SP 800-53 Rev. 5 under component
NIST SP 800-53 Rev. 5 under information technology product
NIST SP 800-53A Rev. 5 under component

  See information system component.
Sources:
CNSSI 4009-2015 under information technology product

  Discrete identifiable information technology assets that represent a building block of a system and include hardware, software, firmware, and virtual machines.
Sources:
NIST SP 800-160 Vol. 2 Rev. 1 from NIST SP 800-53 Rev. 5

  A discrete identifiable information or operational technology asset that represents a building block of a system and may include hardware, software, and firmware.
Sources:
NIST SP 800-161r1

  A hardware, software, or firmware part or element of a larger system with well-defined inputs and outputs and a specific function.
Sources:
NIST IR 8401 under component from DHS RCF - adapted

  A hardware, software, firmware part or element of a larger PNT system with well-defined inputs and outputs and a specific function.
Sources:
NIST IR 8323r1 under component from DHS RCF v2.0 - adapted