Vector images use geometrical primitives to represent images while bitmap images map pixels spatially. JPEG files compress images using lossy compression that doesn't allow exact reconstruction, while GIF uses indexing to select colors from a limited palette. Embedded graphics are contained in documents, while linked graphics reference external files. Color palettes assign numbers to a subset of display colors for pixels. Lossless compression reconstructs original data exactly unlike lossy methods. PNG files overcome GIF and JPEG limitations but don't support animation. BMP files are large and bad for sharing unlike compressed formats. Flickr is a photo sharing site used by bloggers as a photo repository with tagging and browsing tools.