Raster: Computer graphics in which an image is composed of an array of pixels arranged in rows and columns.

Vector: Method of electronically coding graphic images so that they are represented in lines rather than fixed bit maps, allowing an image, as on a computer display screen, to be rotated or proportionally scaled.

• Text should be created and saved out as vector text. 
• Type setting in Photoshop is not recommended but if it is done, make sure to keep the text layer live (not rasterized) and provide the fonts used along with your art file.