system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly are the differences between PDF, JPEG, PNG, TIFF, and other file types and what they mean.
gpt
PDF: Portable Document Format, developed by Adobe is a document format not an image format. It is nowadays a widely acceptable format for distributing documents. In theory you can only view a pdf document and not edit its text, so it's good practice for an organisation or in your office to distribute documents this way.

JPEG: it's an image format, it reduces image size, best for storing photos on your computer or the web.
PNG: Portable Network Format, its main difference with jpeg it's that it's suitable for non-photographic images like logos, cartoons and generally images you design on a computer not photos.

TIFF: when you scan an image in your computer you naturally save your file in this format. TIFF does not compress file size like JPEG or PNG. Some cameras also give you the option to save as TIFF. You do that if you want the best quality possible for your image and want to print to large paper size like A3 or greater.