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Preview is one of macOS' best features, IMO. It's so simple and ubiquitous, but it can open practically anything and does a great job of it. Reading a PDF in it is buttery-smooth, you can even do a respectable amount of editing - both PDFs and images - directly within it. It's one of the last great examples of Just Works.

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So true! Preview is one of those apps that Just Works™. I recently opened a PDF on a Windows 10 computer and was slightly shocked that a _web browser_ opened up to present the PDF. Being able to easily and quickly annotate a screen shots and photos for documentation is a huge boon, too.

Not to forget how easy it is to edit and annotate the screenshots using Preview in macOS.

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