CR2, or Canon Raw version 2, is a proprietary file format developed by Canon for storing images captured by their digital cameras. This format preserves the original data from the camera's sensor, allowing for high-quality image editing without losing detail. CR2 files are typically larger than standard JPEG images due to their uncompressed nature, making them ideal for professional photographers who require flexibility in post-processing. Software like Adobe Lightroom and Photoshop can read and edit CR2 files, enabling users to adjust exposure, color balance, and other settings effectively.