Kinetic typography is a form of graphic design typically constructed digitally to show text, shape and movement with the intent to express emotion in concert. Most of you have seen this represented recently in the Ford F-150 television spots narrated by actor/comedian Dennis Leary. The real power of this medium comes not simply what the words, shapes and fonts says or represents but the addition of motion that brings them to life. Words become more than simply copy representations, they gain personality, and within that the context is MORE than then simply what they spell.

There are fundamental various sub-genre's within this technique as well:

"Kinetic typography is a form of temporal typography (typography that is presented over time). It is distinct from other forms of temporal typography including 'serial presentation', which involves the sequential presentation of still typographic compositions. Barbara Brownie's model of temporal typography divides kinetic typography into 'motion typography' (subdivided into 'scrolling typography', 'dynamic layout') and 'fluid typography'. In dynamic layout, text elements move in relation to one another. In fluid typography, letterforms change and evolve without necessarily changing location." ~ Wikipedia

There are infinite examples if this on the web and I invite you to view them given your time.

• The Kinetic Typography Channel (this is a must see if you start to get enthralled in this movement)
• Art of the Title — A site that catalogs particularly interesting title sequences, many of which feature kinetic typography
• 15 Stunning Motion Typography Videos
• Kinetic Typography at Typophile
• Top 12 Kinetic Typography Films
• Kinetic Typography Animation Tutorial