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PDF

PDFs were invented by Adobe with the goal of capturing and reviewing rich information from any application, on any computer, with anyone, anywhere. I'd say they've been pretty successful so far. If a designer saves your vector logo in PDF format, you can view it without any design editing software (as long as you have downloaded the free Acrobat Reader software), and they have the ability to use this file to make further manipulations. This is by far the best universal tool for sharing graphics.

DNG

Digital Negative (DNG) is a raw image file format for digital photography that's open-source, royalty-free, and highly compatible. It was developed by Adobe to address the lack of an open standard for raw files from different cameras and editing software. DNG files are supported by many software manufacturers, including Apple and Google, and camera manufacturers, including Leica, Casio, Ricoh, Samsung, and Pentax. Editing: DNG files are easier to edit because changes are written directly into the file. Non-destructive editing allows you to revert to the original image data at any time. Size: DNG files are typically 15–20% smaller than RAW files. Storage: DNG files can be compressed, making them ideal for storage and archives. Future compatibility: DNG files are more likely to be openable in the future. DNG files can also be used to store metadata, such as shooting parameters, copyright, and star ratings.