Disruptive innovation refers to new products or services that disrupt existing markets and businesses. Clayton Christensen defined disruptive innovation in 1997 as innovations that enter markets in a simple and convenient way but eventually meet customer needs in new ways. Examples include iTunes disrupting the music industry, Amazon and eBay disrupting brick-and-mortar retail, and Skype disrupting traditional telecommunications. Technological growth, especially on the internet, has accelerated innovation and lowered barriers to entry, allowing new entrants to disrupt incumbent businesses through new distribution channels and business models. Exponential increases in computing power and emerging technologies will likely continue fueling disruptive innovation.