Later in 2009 Silver Lake bought Skype and increased the monthly calling minutes by 150 percent. Skype was introduced in 2003 and acquired by eBay in 2005. Skype is an application software for real time voice and video and other messaging services for Microsoft, Apple, Linux, Android, Apple iOS, Windows Mobile and Symbian Platforms. Skype introduced high quality Voice over IP calls and later they introduced Video over IP and other services like IM, file transfer, desktop sharing and many other. At the same time users mind set and needs of face to face calling encouraged the VoIP market to move towards Video over IP. Introduction of VoIP (Voice over IP) made the voice market competitive thus call rates came down drastically.

People were using traditional PSTN lines for voice communication for long time. Skype is a software application for real time voice, video and IM services. Microsoft acquired Skype in early May 2011 and Skype has become one business division of Microsoft. Microsoft Skype vs Skype | MS Skype New Integrated Features

Web skype vs program skype