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A–Z glossary of device software terms

Find plain-language definitions for the vocabulary of device software. Each term includes context, an example, and a boundary that helps distinguish it from…

Studio render of a machined aluminium index tray holding a row of thin frosted acrylic cards, each card bearing a small inlaid component: a connector, a chip and a capacitor

Find plain-language definitions for the vocabulary of device software. Each term includes context, an example, and a boundary that helps distinguish it from a similar but different concept.

Definitions with a practical boundary

Technical words can describe different layers depending on context. An endpoint is not necessarily a physical socket, a version is not automatically a quality score, and a digital signature does not establish compatibility by itself. These definitions preserve those distinctions instead of reducing each term to an advertising label or an unexplained acronym.

Use the surrounding explanation

Follow the related references when a short definition raises a second question. The glossary is deliberately linked to articles and built-in-tool guides, so you can move from a word to a concrete observation. It does not contain product rankings or endorsements. Named standards and operating-system terms are used descriptively, and no manufacturer relationship is implied by their inclusion.

A

ArchitectureIn computing, architecture describes the processor's instruction set and the operating system build designed for it, such as x64 or Arm64. Drivers must be…

B

BandwidthBandwidth is the maximum amount of data a connection can carry in a given time, usually expressed in bits or bytes per second. It sets an upper limit on…BusA bus is a shared communication pathway that connects devices to a computer and defines how they are discovered, addressed and exchange data. USB and PCI…

C

Catalog fileA catalog file, ending in .cat, records cryptographic hashes for every file in a driver package and carries a digital signature, letting Windows confirm the…Class driverA class driver is a general driver that serves every device following a particular standard, such as USB audio or mass storage, so that individual makers do…CodecA codec is software or hardware that encodes and decodes media, compressing audio or video for storage or transmission and expanding it again for playback…Compatible IDA compatible ID is a broader identifier a device reports in addition to its hardware IDs, usually naming a device class or standard. Windows uses it when no…ControllerA controller is a hardware component that manages a bus or a class of devices, coordinating communication between the processor and the devices attached to…

D

DescriptorA descriptor is a structured block of data that a device provides to describe itself: its identity, capabilities, configurations and the endpoints it…Device instanceA device instance is one particular occurrence of a device as Windows tracks it, combining the device's identity with where and how it is connected. Each…Digital signatureA digital signature is cryptographic proof attached to software that identifies its publisher and shows the content has not changed since signing. Windows…DriverA driver is software that lets an operating system communicate with a specific piece of hardware, translating general requests such as print this page into…Driver storeThe driver store is a protected location where Windows keeps verified copies of driver packages. Packages are staged there first and then installed on…

E

EndpointAn endpoint is a defined destination or source for data within a device, most commonly a numbered channel in a USB device through which a specific type of…EnumerationEnumeration is the process by which a bus driver discovers the devices attached to it, reads their identifying information and reports each one to Windows…

F

Filter driverA filter driver sits in a device's driver stack above or below the main function driver and inspects or modifies requests as they pass, adding behaviour…FirmwareFirmware is software permanently stored on a hardware device and executed by that device's own processor. It governs the device's internal behaviour before…

H

Hardware IDA hardware ID is a vendor-defined identification string reported by a device. Windows compares it with the identifiers listed in driver packages to decide…

I

INF fileAn INF file is the structured text file inside every Windows driver package. It lists supported device identifiers, files to copy, registry settings…

K

KernelThe kernel is the privileged core of an operating system. It controls memory, schedules work on the processor and hosts the kernel-mode drivers that talk…

L

LatencyLatency is the delay between a request and its response, such as the time between pressing a key and the character appearing, or between sending audio and…

O

Operating systemThe operating system is the foundational software that manages a computer's processor, memory, storage and devices, and offers a consistent set of services…

P

Plug and PlayPlug and Play is the set of mechanisms by which Windows detects hardware, identifies it, assigns resources and selects a driver automatically, without the…Print spoolerThe print spooler is the Windows service that accepts print jobs from applications, stores them in a queue and hands them in order to the printer driver and…ProtocolA protocol is an agreed set of rules for how two parties format, send and acknowledge data. Devices, buses and networks all depend on protocols so that…

R

RollbackA rollback restores a device to the driver package it used before the most recent change, using a previous package Windows kept in the driver store. Device…

U

User modeUser mode is the restricted execution level where applications and some drivers run. Code in user mode cannot touch hardware or other programs' memory…

V

VersionA version is the identifier a publisher assigns to a particular release of a driver package, typically four dot-separated numbers that should increase with…