The Page Gallery plugin allows users to generate a gallery view of selected pages in Obsidian, showcasing images or content based on specific queries. The gallery is customizable, supporting different layouts, columns, and orientations. It relies on the 'obsidian-dataview' plugin for querying metadata and pages. Users can define views that filter pages based on tags, metadata, and other criteria, and display those pages with a customizable layout, including options like portrait or landscape orientation. The plugin offers additional settings for fine-tuning image display, such as gutter size, image scaling, and positioning.