Bitmap images, also called raster or paint images, are made of individual dots
called pixels (picture elements) that are arranged and colored differently to form a
pattern. When you zoom in, you can see the individual squares that make up the total
image. Increasing the size of a bitmap has the effect of increasing individual pixels,
making lines and shapes appear jagged. Reducing the size distorts the original image
because pixels are removed to reduce the overall image size.

Because a bitmap is created as a collection of arranged pixels, its parts cannot
be manipulated (e.g., moved) individually.

Remember  that objects are created as collections of lines in vector graphics,
and bitmap images are made of individual pixels arranged in patterns. Of the two
formats, bitmap images are great for photographs because they tend to offer greater
subtleties for shading and texture but require more memory and take longer to print.
Vector images are best for drawings that need sharper lines, more detail, and easy
modification. Vector images require far less printing resources.