Home › Entities › access_control › CAPTCHA

CAPTCHA

computer test to discriminate human users from spambots
Product access_control Q484598
CAPTCHA
No original authorship · Public Domain · Wikimedia
Press Enter · cited answer in seconds

CAPTCHA

Summary

CAPTCHA is an access control[1]. CAPTCHA draws 5,485 Wikipedia views per month (access_control category, ranking #2 of 4).[2]

Key Facts

  • CAPTCHA's instance of is recorded as access control[3].
  • CAPTCHA is used for discrimination[4].
  • CAPTCHA's Commons category is recorded as Captcha[5].
  • January 1, 2000 marks the founding of CAPTCHA[6].
  • CAPTCHA's official website is recorded as http://captcha.net[7].
  • CAPTCHA's described by source is recorded as Security Engineering: A Guide to Building Dependable Distributed Systems, 2nd edition[8].
  • CAPTCHA's different from is recorded as reCAPTCHA[9].
  • CAPTCHA's named by is recorded as Luis von Ahn[10].
  • CAPTCHA's named by is recorded as Manuel Blum[11].
  • CAPTCHA's named by is recorded as John Langford[12].
  • CAPTCHA's named by is recorded as Nicholas John Hopper[13].

Why It Matters

CAPTCHA draws 5,485 Wikipedia views per month (access_control category, ranking #2 of 4).[2] CAPTCHA has Wikipedia articles in 30 language editions, a strong signal of global cultural recognition.[14] CAPTCHA is known by 38 alternative names across languages and contexts.[15]

Related Entities

access control John Langford Luis von Ahn Manuel Blum Nicholas John Hopper

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . wikidata.org.
  7. [9] ↑ . wikidata.org.
  8. [10] ↑ . wikidata.org.
  9. [11] ↑ . wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [14] ↑ . Wikidata sitelinks. wikidata.org.
  3. [15] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). CAPTCHA. Retrieved May 3, 2026, from https://4ort.xyz/entity/captcha
MLA “CAPTCHA.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/captcha.
BibTeX @misc{4ortxyz_captcha_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{CAPTCHA}}, year = {2026}, url = {https://4ort.xyz/entity/captcha}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): CAPTCHA — https://4ort.xyz/entity/captcha (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/captcha · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 5w ago · Twofivesixbot bot · 2026-05-25 view diff on Wikidata ↗
    Local thumb → —
    Inception → +2000-01-01T00:00:00Z
    Instance of → access control
    Aliases → —
    + 8 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update-qualifiers:1||1|1 */ [[Property:P8189]]: 987007542910105171, mv to monolingual text names on J9U statements"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.