JPG (or JPEG) and PNG are both digital image file formats, but they use fundamentally different compression techniques. JPG employs lossy compression, meaning it permanently discards some image data to achieve significantly smaller file sizes, which is excellent for photos but can cause artifacts and blurring. PNG uses lossless compression, preserving all the original image data without quality degradation upon saving, leading to larger files. A key distinction is that PNG supports transparency, allowing for clean, partial, or full see-through areas, while standard JPG does not.

JPG is the dominant format for photographs on websites, images from digital cameras, and platforms like social media due to its efficient storage. PNG is preferred for graphics requiring sharp edges and transparency, like logos displayed over website backgrounds, detailed screenshots (especially of text or UIs), and digital artwork where precise pixel detail matters.

The major advantage of JPG is its small size, ideal for web loading speeds and storage. Its limitation is the irreversible quality loss upon heavy compression. PNG guarantees quality and supports transparency but results in much larger files. While PNG has no DRM limitations (unlike some formats), its larger size can hinder web performance if used for unsuitable content like large photographs. This trade-off between quality/size and transparency dictates format selection for specific needs.