A Gallery in WordPress is similar to a gallery on your mobile phones. In the Gallery, all the media files are stored such as Images, Videos, illustrations, photographs and other media files. You can upload any number of images and use them whenever and wherever in your posts.
WordPress comes with an in-built feature of “Create Gallery” which allows you to add a simple image gallery to pages or posts on your site. The WordPress Gallery is represented in the form of rows and columns. You can also add more layouts and customization using gallery specific themes and plugins.