MrSID (Multi-Resolution Seamless Image Database) is a proprietary geospatial image format developed by LizardTech (now part of Extensis). It's designed for efficient storage, retrieval, and manipulation of very large raster images, particularly aerial and satellite imagery, maps, and other geospatial data. MrSID files utilize wavelet compression, which allows for high compression ratios while maintaining good image quality. This makes them suitable for distributing large images over networks with limited bandwidth. The format supports multiple resolutions, enabling users to zoom in and out without having to load the entire image at once. MrSID images are often used in GIS (Geographic Information Systems) applications, remote sensing, and mapping projects. The format also supports georeferencing, allowing images to be accurately positioned on the Earth's surface. MrSID files can be lossy or lossless, depending on the compression settings used during creation. The format is widely supported by GIS software and image viewers, making it a popular choice for distributing and sharing large geospatial datasets.