What it is: In Adobe Test&Target, "mbox" is a term used to describe a spot on the page that can be controlled by Test&Target.

What it's not: Visible (generally). Mboxes are invisible to site visitors without special tools or plug-ins to look for the Adobe mbox code.

Why we care: Next time you hear someone mention an mbox, you'll know that it's a spot on a site that is being monitored or tested using Adobe testing products.

This post is part of an ongoing Clickipedia series, defining all the terms you need to know for conversion rate optimization. Keep checking back each week to learn more, and don’t forget to check out the whole series.