# human interface device

> any computer device used for interaction with a user

**Wikidata**: [Q1348085](https://www.wikidata.org/wiki/Q1348085)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Human_interface_device)  
**Source**: https://4ort.xyz/entity/human-interface-device

## Summary  
A **human interface device (HID)** is any computer hardware component that enables a user to interact with a computer system, such as keyboards, mice, touchscreens, indicator lights, and specialized assistive devices. It is classified as a subclass of computer hardware, computer interfaces, and input‑output devices, and it underpins the field of human–computer interaction.

## Key Facts  
- **Definition:** Any computer device used for interaction with a user (Wikidata description).  
- **Classification:** Subclass of *computer hardware*, *computer interface*, and *input‑output device*.  
- **Parent categories:** Part of *computer hardware* and *input‑output device* classes; related to *assistive technology for blind computer use*, *computer keyboard*, *pointing device*, *touchscreen*, *indicator light*, *turbo button*, *switch access*, and *rackmount KVM*.  
- **Sitelink count:** 15 Wikipedia language links (ar, ca, commons, da, de, en, es, ja, ko, nl).  
- **Aliases:** HID, Human Interface Device, dispositivo de interfaz humana, Zugriff auf Eingabegeräte, ヒューマン・インターフェース・デバイス, интерфейсное устройство, человеко‑машинный интерфейс.  
- **Related protocol:** HID++ – a proprietary HID protocol developed by Logitech.  
- **Manifestation of:** Human–computer interaction (HCI).  
- **Stack Exchange tag:** https://stackoverflow.com/tags/hid.  
- **Commons category:** Human Interface Device HID.  

## FAQs  
### Q: What exactly is a human interface device?  
A: It is any hardware component—such as a keyboard, mouse, touchscreen, or indicator light—that allows a person to send input to or receive output from a computer.  

### Q: How does a HID differ from a generic input device?  
A: While all HIDs are input (or output) devices, the HID classification also includes output‑only components (e.g., indicator lights) and devices designed for accessibility, making it a broader, standardized category within computer hardware.  

### Q: What are common examples of HIDs?  
A: Common HIDs include computer keyboards, pointing devices (mouse, trackpad), touchscreens, indicator lights, turbo buttons, switch‑access devices for disabled users, and rack‑mountable KVM units.  

### Q: Is there a standard protocol for HIDs?  
A: Yes. The USB Human Interface Device (HID) class defines a universal protocol, and Logitech’s proprietary HID++ protocol extends this standard for its devices.  

### Q: Why is the HID classification important for developers?  
A: It provides a consistent API across operating systems, allowing software to interact with a wide range of peripherals without needing device‑specific drivers.  

## Why It Matters  
Human interface devices are the physical bridge between people and digital systems. By standardizing how computers recognize and communicate with peripherals, HIDs enable seamless, plug‑and‑play experiences that reduce development overhead and improve accessibility. They support everyday tasks—from typing and navigating to receiving visual feedback—while also empowering specialized assistive technologies for users with disabilities. The ubiquity of HIDs across consumer electronics, industrial control panels, and medical equipment underscores their role in shaping how humans interact with technology, driving innovation in ergonomics, user experience design, and inclusive computing.  

## Notable For  
- **Broad Scope:** Encompasses both input (keyboard, mouse) and output (indicator lights) devices, plus assistive technologies.  
- **Standardization:** Defined by the USB HID class, enabling cross‑platform compatibility without custom drivers.  
- **Assistive Impact:** Includes devices like switch access and blind‑use technologies, extending computer access to disabled users.  
- **Industry Extensions:** Logitech’s HID++ protocol demonstrates how manufacturers build proprietary features atop the HID standard.  
- **Foundational Role in HCI:** Serves as the tangible manifestation of human–computer interaction concepts.  

## Body  

### Definition and Scope  
- A human interface device (HID) is any computer hardware that facilitates user interaction.  
- The term covers a wide range of peripherals, from traditional keyboards and mice to modern touchscreens and status LEDs.  

### Classification Hierarchy  
- **Superclass:** Computer hardware – the physical components of a computer system.  
- **Sibling Classes:** Input‑output device – peripherals that provide either input, output, or both.  
- **Subclasses:**  
  - *Computer keyboard* – key‑based text entry.  
  - *Pointing device* – moves on‑screen cursors (e.g., mouse, trackpad).  
  - *Touchscreen* – combined input and display surface.  
  - *Indicator light* – visual status feedback.  
  - *Turbo button* – performance‑control button on older PCs.  
  - *Switch access* – adaptive device for disabled users.  
  - *Rackmount KVM* – keyboard‑video‑mouse switch for server racks.  

### Relationship to Human–Computer Interaction (HCI)  
- HIDs are the physical manifestation of HCI principles, translating human actions into digital commands and vice versa.  
- Their design influences ergonomics, accessibility, and overall user experience.  

### Standards and Protocols  
- The USB HID class defines a universal communication protocol, allowing operating systems to recognize devices without bespoke drivers.  
- Logitech’s proprietary **HID++** protocol extends the base HID specification for enhanced functionality in its product line.  

### Accessibility and Assistive Technology  
- HIDs include specialized devices such as *switch access* and *assistive technology for blind computer use*, ensuring that users with varying abilities can interact with computers effectively.  

### Community and Documentation  
- Developers reference the **Stack Exchange** tag `hid` for troubleshooting and implementation guidance.  
- Academic identifiers (e.g., Semantic Scholar topic ID 498557) link HIDs to research literature on interaction design.  

## Schema Markup  

```json
{
  "@context": "https://schema.org",
  "@type": "Thing",
  "name": "Human interface device",
  "description": "Any computer device used for interaction with a user.",
  "url": "https://en.wikipedia.org/wiki/Human_interface_device",
  "sameAs": [
    "https://commons.wikimedia.org/wiki/Category:Human_Interface_Device_HID"
  ],
  "additionalType": "ComputerHardware"
}

## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)