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Mashup - The act of combining content from multiple sources into one offering. The concept of mashups has been around in the music world for a long time, where the music from one song was blended with new vocals (or vocals from another song).

In recent years, publishers have been seeking ways to tag content in such a way to allow them to combine interrelated elements by topic or keyword. These mashups essentially create infinite opportunities for reuse of content to create new offerings.

Metadata - Data about a file or asset is used to locate and organize files. Metadata can include physical properties of a file (size, width/depth, DPI, color space, file type, etc) or user-defined based upon a pre-defined schema.

Module - A segment of an application system that is distinct in function but interrelated to other portions of that application system. An example of two modules of one system would be a production module and a billing module.

Multivariate Testing (also called A/B Testing) - A process by which more than one component of a website may be tested in a live environment. Companies perform multivariate testing to determine which versions of a piece of content will perform better. This can include which will generate more page views, or which will 'convert' the reader to an action.

Multivariate testing requires some analytics appliance to measure. Most products like Google Analytics, Omniture, and Nielsen Net Ratings have functionality that allow for multivariate testing.