What does computability mean?

What does computability mean?
A spoken definition of computability.

Intro Sound:
Typewriter - Tamskp
Licensed under CC:BA 3.0

Outro Music:
Groove Groove - Kevin MacLeod (incompetech.com)
Licensed under CC:BA 3.0

Intro/Outro Photo:
The best days are not planned - Marcus Hansson
Licensed under CC-BY-2.0

Book Image:
Open Book template PSD - DougitDesign
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Text derived from:
http://en.wiktionary.org/wiki/computability

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