How Can I Remove Displaymarketplace.com - Effectively Get Rid of Displaymarketplace.com

Help! I've been having problems with my site being automatically redirected to the "aperture.displaymarketplace.com". This started happening today and I'm being redirected to this site almost every time I got to any website.What is this displaymarketplace.com? How can I remove it?

Displaymarketplace.com: