Handango.com is one of the VERY first app markets out there, long before android came about. We're talking palm pc, even before pocketpc which was before even Windows mobile.
It's just YET another marketplace to spend on apps. Think amazon market, Samsung market, etc.
On the other hand, no idea what you installed that got you their market. I HAVE heard of a few apps installing this that came from pirate sites.
Current Phone: Sprint Galaxy Note II
ROM: Rooted "stockish" MA7
Current Tablet: Nexus 7 (Rooted stock 4.12)