What is a "MOSFET"?

[1zacster]

I googled around and found nothing at all! On newegg I found a category and youtube I saw a very long chip that looked like a dip chip but not on what it does.

 

[alexoiu]

Transistors used for voltage regulation.
http://en.wikipedia.org/wiki/MOSFET

 

[vinaykumar5320]

If you don't want to go into much details,...
In simple words, it's used mainly as a Switch in the Digital Circuitry.