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CAPTCHA

Definition:

CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart and is a spam prevention tool used on Internet web sites. CAPTCHA commonly appears on blog sites as a series of random letters or numbers, sometimes with a squiggly line through them, that a human must replicate before submitting a comment on the blog site.

This extra step of human intervention prevents malicious robots or scripts from automatically submitting spam comments on a blog without the author's permission. In theory, CAPTCHA numbers and letters are unreadable by computers meaning a comment can only be submitted if a human verifies the numbers and letters.

Here's a word you may not know...

megapixel

A megapixel describes the quality of a digital picture or camera. 1 megapixel is equal to 1 million pixels. A higher megapixel number means a digital camera can store more information or detail with each picture taken. Higher megapixels also allow you to more efficiently crop a digital picture without sacrificing the quality of the picture.