Tiled gallery is the an elegant way of displaying photo galleries in WordPress, the good thing about tiled galleries is, they automatically organizes all photos a responsive way that they appear all fixed inside your post without leaving any blank space.
Default WordPress galleries shows up images in columns, suppose you have five images assigned to three columns then it would be showing three images in first line and two in the second line leaving a blank whitespace in third column which doesn’t appears to be good. But this is not with tiled galleries. Tiled galleries automatically fixes up all images in a mosaic view that they don’t show up any blank space.