Simply Instagram displays your photos from Instagram either using Widget or Short Code.
I installed this, and it works, looks good, but was hacked after a couple days, and now someone elses posts are appearing.
Mason.ry or something is getting messed up and just overlaying each photo (the containing div actually) atop one another. Could be conflicts with jQuery in the theme, didn't really have time to thoroughly test it.
I have an e-commerce site where I wanted to add an instagram sidebar. I chose this plugin as it looked alright and did the job, however I realised later it MASSIVELY SLOWED my site's page loading time.
I have therefore removed the plugin. I do not recommend this plugin if your website is something other than a blog.