What's the difference between
and
Enter two words to compare and contrast their definitions, origins, and synonyms to better understand how those words are related.

S vs Captcha - What's the difference?

s | captcha |

As a letter s

is the letter s with a.

As a noun captcha is

(captcha).

s

Translingual

{{Basic Latin character info, previous=r, next=t, image= (wikipedia s)

Letter

  • The nineteenth letter of the .

    • Symbol

    (wikipedia) (mul-symbol)
  • voiceless alveolar fricative
  • Symbol for second , an SI unit of measurement of time.

    • See also

    (Latn-script) * * (esh) * (dze) * {{Letter , page=S , NATO=Sierra , Morse=ยทยทยท , Character=S , Braille=? }} Image:Latin S.png, Capital and lowercase versions of S , in normal and italic type Image:Fraktur letter S.png, Uppercase and lowercase S in Fraktur Symbols for SI units ----

    captcha

    English

    Noun

    (en noun)
  • A CAPTCHA is a human response test that requires you to enter a series of letters and/or numbers and/or symbols correctly to prove you are a human and not a computer program attempting to spam the site.
  • (by extension) Anything that a human must do to prove that they are not a computer.

    • Derived terms

    * audio CAPTCHA, a distorted audio file containing a voice reading numbers. * visual CAPTCHA, when a distinction must be made between an audio CAPTCHA and a distorted image.

    Usage notes

    Although occasionally spelt with lowercase letters (captcha), or with an initial uppercase letter (Captcha), most authors remain aware of its origin as an acronym and use uppercase. abandoned their attempt to trademark this term in 2008, as usage was already too widespread. (USPTO file number 78500434).

    See also

    * Turing test * ("CAPTCHA" on Wikipedia) English eponyms