That is Just Your Type
Just as there are different software programs
for different design task, there are also
different types of data information that make
those programs work effectively.
Raster data is used to describe
small areas of color information (pixels)
within scanned images. Type can also be "rasterized",
which eliminates font problems but can make
small type hard to read.
Word processing programs create pages of
type, and the data that describes those pages
is called symbolic data.
This data is editable and easy to work with.
Vector data describes the
shapes, lines and fills for the drawings and
type created in an illustration program.
A bitmapped file uses, bitmap data,
which usually can't be edited and describes
all of the elements on your page in terms
of the resolution of the output device.