Defining Vocabulary

Raster Image - This is also called a bitmap. It's a data structure representing a rectangular group of pixels.

Vector Image - The use of geometrical primitives.

Tracing - Creating a mock-up of a Web page image in a graphics program and then use it as a visual guide to re-create or trace the Web page design.
Rasterizing - The process of converting a vector image into a bitmap image.

Anchor Point - The part of a path that ties the path down to the page.
Path - Vector based drawings.
Attribute - An attribute goes with a tag to provide some extra information, or to modify the meaning slightly.
Bezier Path - a parametric curve frequently used in computer graphics and related fields.

Crop - To cut out or trim unneeded portions of an image.

Clipping Mask/Path - An entity which controls the behavior of a collection of pixels.