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Bitmap
Graphic made up of pixels. As image is magnified, it becomes pixilated. For example, a photo is a bitmap.

Hotspot
An area placed on an image that links part of the image to another URL or has a behavior attached to it.

Mask
An area placed on an image or object that may have techniques applied to it to create special effects.

Rollover
A button or image that changes when rolled over (MouseOver event, and returns to the original button or image when rolled off of the object (MouseOverevent).

Slice
An area placed on an image that links part of the image to another URL or has a behavior attached to it. Slices may be cut up and moved around on the page.

Vector
Graphic with path and points. Image can be magnified and retains its quality. For example, a square drawn with the Rectangle tool is a vector image.