what is the difference between .iso and .img file
Answer Wiki. .iso files and .img files are used to keep a copy of a disc with information about its file structure. .iso files cannot be compressed, while .img files can be either compressed or uncompressed. If an .img file is uncompressed, you could rename it to .iso and it would still function. .iso files are now the standard and are commonly used to share copies of discs, such as installation CDs and DVDs, for example for a program or an operating system.