An ESCO provides energy-efficiency-related and other value-added services and for which performance contracting is a core part of its energy-efficiency services business.

FORBES: Energy Services Sector Sustained by "MUSH" Markets

Unlike online travel agencies such as Expedia, Orbitz and Priceline, Kayak does not provide online bookings directly but gives consumers a one-stop search solution to the best fares along with other value-added services like flight status updates and pricing alerts.

FORBES: How Big Of A Threat Is Google To Kayak?

Unlike other e-commerce platforms, Rakuten offers a host of value-added services to merchants on its platform.

FORBES: Asia's Rising E-Commerce Nation: A Q&A With Rakuten Malaysia CEO Masaya Ueno