Image Alternate Tag -
Search Engines love them!
Within the 'Image Properties' there is an 'Alternate Tag' . The Alternate Tag is for the search engines. This helps the search engine determine what category and how to index the image and the web site. Use keywords to describe the picture/image.
Do NOT skip entering Alternate Tag on pictures -- search engines will have a harder time ranking your site and understanding you. Give the Search Engines everything, your ranking will improve.
See User's Guide for detailed instructions.e Chapter - Images, Pictures, Logos, etc.