Definition

Photo sharing tools act as repositories for photos, most of them allow sharing under a creative commons license. Some of them allow you to create slideshows for blogs and wikis.

Examples

Flickr
The largest site
Photobucket
Creates slideshows easily for adding to blogs
Webshots

Used for:

1. Faculty sharing medical images with students
2. Students sharing images of their community with peers
3. Finding images to include in educational material
4. Creating slideshows.