<p>Picasa is an image organizer and viewer for organizing and editing digital photographs that includes an integrated photo-sharing website. </p><p>For organizing photos Picasa has file importing and tracking features, tagging, facial recognition, and collections for sorting. It offers basic photo editing functions including color enhancement, red eye reduction, cropping, and adding text to images. Other features include slide shows, printing, and image timelines. Picasa does not store the photos you view or edit, it simply looks at folders on your computer to find photos to display. It can display the file types you tell it to from the folders you tell it to search. When editing images in Picasa your original files are never altered. You can choose to save your edits and Picasa will create a new version of the photo, leaving the original intact. </p><p>Images can be prepared for external use, such as e-mailing or printing, by reducing file size and setting up page layouts. There is also integration with online photo printing services. Picasa uses picasa.ini files and IPTC Information Interchange Model keyword data (JPEG files only) for tracking keywords for each image. </p><p>The following file types are supported in Picasa (for Windows):</p><p>Photos: .jpeg, .tif, .tiff, .bmp, .gif, .psd (Photoshop), .png, .tga, and selected RAW formats.</p><p>Movies: For general playback: .mpg, .mod, .mmv, .tod, .wmv, .asf, .avi, .divx, .mov, .m4v, .3gp, .3g2, .mp4, .m2t, .m2ts, .mts, .mkv. For several of these file types, the correct software is required for playback. </p><p>For use in Movie Maker: .avi, .asf, .wmv, .mpg, .m2t, .mmv, .m2ts</p><p>Audio (for slideshows and the Movie Maker): .wma and .mp3 </p><p>Animated GIF files will not animate in Picasa</p>