CR2 file contain uncompressed and untouched raw image data from Canon cameras. These raw files are also sometimes called digital negatives. The purpose of raw files is to get maximum information from the sensor of the camera to give possibilites to adjust the image later (e.g. white balancing and color grading). CR3 files were introduced in 2018 as the successor of .CR2 files.
PNG or Portable Network Graphic format is a graphic file format that uses lossless compression algorithm to store raster images. It uses 2 stage compression methods. It is frequently used as web site images rather than printing as it supports only the RGB color model. So CMYK color images cannot be saved as PNG image.
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