What is an ISO file format mainly used for?

The ISO file format is primarily recognized for its role in creating disc images of optical media. This means it encapsulates all the data and file structure of a CD, DVD, or Blu-ray disc into a single file. ISO files are common for software distribution, allowing users to download and then burn or mount the image to create the equivalent optical disc. This format preserves the exact structure and content of the original disc, making it practical for software installations and media playback.

While some other options may overlap in functionality, they do not specifically relate to the core function of an ISO file. For instance, data backup on cloud storage involves different file management systems and protocols, which do not require the disc image format that ISO provides. Similarly, while ISO files can be used to distribute software, the focus is on the disc imaging aspect rather than creating images for software installations specifically. Lastly, the creation of high-resolution videos pertains more to video file formats and codecs, rather than an ISO format, making it irrelevant in this context.