Hi. Not quiet. In a regular partial eclipse part of the Sun is covered by the Moon. So it might look sort of like this (to show some particularly dramatic photos):

http://apod.nasa.gov/apod/ap090128.html or http://apod.nasa.gov/apod/ap110105.html

In an annular eclipse the moon is just a bit too far away (or the Earth is a bit to close to the Sun) for the moon to completely cover the Sun, so that at the maximum of the eclipse the moon covers an area in the middle of the Sun, with bright sun visible all around it (this ring is called an annulus):

http://apod.nasa.gov/apod/ap100122.html or http://apod.nasa.gov/apod/ap020610.html

Just to add to what was said before me. An annular eclipse is also one particular type of partial eclipse as opposed to a total eclipse which covers all of the Sun completely.