It is a smart phone app.
You take a picture (from your phone, a camera or the internet) and upload it into Instagram.
You can edit your pictures (resizing them, changing the filters, adding blur)
You can caption it, hashtag it (like in Twitter), and even add a location to it.
You can follow people (like Twitter)
You can like their pictures.
That is essentially it.
I think it is pretty cool.
I follow some professional photographers, who have some pretty neat photos. I follow bracelet makers so I can see their work (I have been knotting friendship bracelets lately). I have found some people who take pictures around places that I used to live.
Yeah, there are some people out there who put on hipster glasses, do an emo pose and filter the photo so it looks so incredibly fake, but whatevs.