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...

toner

Toner is a dry ink powder that carries an electric charge. It is often used in laser printers, fax machines, and copiers. Paper is electronically charged to attract the toner to specific areas on the paper in order to create characters and words. Toner cartridges are typically more expensive than ink cartridges, but do not need to be replaced as often.