Twitter bootstrap
You probably say Twitter Bootstrap . Not to be confused with normal bootstrap , something else.
Twitter bootstrap is a small (frontend) css / js "framework" with which you can create fluid web pages. Thus, this is for web design only.
This means that when you resize the browser, all elements will also be resized, so that it even displays everything well on the mobile device.
For examples and more information check out their github page: http://twitter.github.com/bootstrap/
What is self-tuning? (Bootstrap)
Bootstrap (or self-tuning) is something else. A bootstrap is a piece of code that runs when the machine (or application) first starts. The boot file contains all sorts of standard configurations to configure.
There are actually more details in the history of the bootstrap, so read the wikipedia article for more information:
http://en.wikipedia.org/wiki/Bootstrap
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