Here is an image with width, height, border, and alt description defined:

In Internet Explorer, hold your mouse over the image to see the alt description.

Here is an image that is aligned "left." See how the text flows around the image.

Here is an image that is aligned "right." The text also flows around this image.

Here is an image that is aligned "middle." It stays in the middle of the line. Text does not really "flow" around this picture, but simply drops down to another line.

Here is an image with a border of 2: