Over-the-top - (OTT, Over-the-top Video, Over-the-Internet Video) - Over-the-top is a general term for service that you utilize over a network that is not offered by that network operator. It's often referred to as "over-the-top" because these services ride on top of the service you already get and don't require any business or technology affiliations with your network operator.  Sprint is an "over-the-top long distance service as they primarily offer long distance over other phone company's phone lines. Often there are similarities to the service your network operator offers and the over-the-top provider offers.

Over-the-top services could play a significant role in the proliferation of Internet television and Internet-connected TVs.

This term has been used to (perhaps incorrectly) describe IPTV video also. See Internet (Broadband) TV.
Over-the-top-TV - (OTT) - Over-The-Top Home Entertainment Media - Electronic device manufacturers are providing DVD players, video game consoles and TVs with built-in wireless connectivity. These devices piggy back on an existing wireless network, pull content from the Internet and deliver it to the TV set. Typically these devices need no additional wires, hardware or advanced knowledge on how to operate. Content suited for TV can be delivered via the Internet. These OTT applications include Facebook and YouTube. Also see Internet-connected TVs.

Overbuilder