Gallery block

Lightbox — by default, the images open up in a lightbox when clicked, with arrows for users to cycle through all the images, but it can be turned off if preferred
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"Allow high resolution downloads" — Run compresses images on your web page, but when this option is selected, users who click the download icon on the image will receive a browser download of the original image that you uploaded
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Number of images per row, from 1 to 4 — the more per row, the smaller they are
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"Masonry layout" — by default, all images get automatically cropped to a perfect square for display on the grid, but this option shows all your images uncropped, with staggered positioning

When you want to showcase a large number of images
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As a nice design element on a page, for example, a single row of 4 images to create some design separation in the middle of a bio. When used in this context, we recommend using the short top and bottom options, accessible under the Advanced tab of the block sidebar.