Skype (software)

Skype (software)
Name	Skype
Developer	Microsoft Corporation
Initial release	29 August 2003
Latest release version	(varies by platform)
Programming language	C++, C#
Operating system	Microsoft Windows, macOS, Linux, Android, iOS
Platform	x86, x86-64, ARM
Language	Multilingual
License	Proprietary freemium

Skype (software) is a proprietary freemium telecommunications application that provides voice calls, videotelephony, instant messaging, and file transfer services across personal computers, mobile devices, and television sets. Launched in 2003, it introduced widespread consumer VoIP use and later became a core component of Microsoft’s unified communications strategy following acquisition. The service interoperates with traditional public switched telephone networks through gateways and has influenced rival services and standards across the technology industry.

History

Skype was founded in 2003 by entrepreneurs who previously worked on peer-to-peer projects and file-sharing services, drawing on experiences associated with companies like KaZaA and eDonkey2000. Early funding involved investors connected to Index Ventures and other venture capital firms based in London and Stockholm. Rapid user growth led to acquisition by eBay in 2005, which positioned Skype alongside online marketplaces and payment platforms such as PayPal. Operational tensions and strategic misalignment led to eBay selling a majority stake, and in 2009 a consortium including Silver Lake Partners, Andreessen Horowitz, and other investors purchased Skype. In 2011 Microsoft announced a definitive agreement to acquire Skype, integrating it with products like Windows Live Messenger, Xbox Live, and Office 365. Regulatory reviews by bodies including the European Commission and the United States Department of Justice preceded the acquisition. Over subsequent years, Skype underwent architecture changes, transitioning from a peer-to-peer network model originally influenced by protocols used by Kazaa technology to cloud-hosted services running on infrastructure comparable to offerings from Microsoft Azure. The service has seen iterations responding to competition from products such as Google Hangouts, Zoom Video Communications, FaceTime, and WhatsApp Messenger.

Features

Skype offers voice over IP calls, video conferencing, instant messaging, presence indicators, screen sharing, and file transfer. It supports group video calls with features comparable to conferencing tools like Cisco Webex, BlueJeans Network, and GoToMeeting. Integration allows calling to and from public telephone numbers via subscription or pay-per-minute credits, interoperating with national carriers such as BT Group in the United Kingdom and legacy operators globally. Additional features include voicemail, call forwarding, number portability services, and contact importing that can link with social platforms like Facebook and productivity services like Microsoft Outlook. Skype’s ecosystem has included APIs and developer programs enabling third-party integrations comparable to ecosystems run by Slack Technologies and Atlassian Corporation Plc.

Platforms and compatibility

Skype provides client applications for desktop operating systems including Microsoft Windows and macOS, distributions of Linux via packaged binaries, and mobile platforms such as Android (operating system) and iOS. It also ships on devices and platforms like Amazon Fire TV, smart televisions integrating with vendors such as Samsung, and game consoles including Xbox One and Xbox Series X/S. Web-based access has been supported through modern browsers including Microsoft Edge, Google Chrome, and Mozilla Firefox with WebRTC-related capabilities similar to implementations by Google and Mozilla. Enterprise and legacy interoperability has been provided through gateways and connectors for systems from vendors like Avaya and Poly.

Business model and ownership

Skype operates on a freemium model: basic person-to-person services are offered at no cost while monetized features require subscription or usage fees. Paid services include outbound calls to public telephone networks, subscription-based unlimited calling plans, caller ID numbers, voicemail, and SMS-out features, with billing handled through Microsoft accounts and payment processors such as Visa and Mastercard via merchant relationships. Following acquisition, Skype became a wholly owned subsidiary and product line within Microsoft Corporation, aligning monetization and strategic initiatives with Microsoft’s cloud and productivity offerings like Microsoft Teams and Office 365. Strategic positioning has shifted over time, sometimes consolidating features into Microsoft’s enterprise communications portfolio and at other times competing directly in consumer markets against services such as Viber and LINE Corporation.

Security and privacy

Skype’s security model evolved from a decentralized, peer-to-peer encryption approach to server-mediated communications managed by Microsoft. Early claims of end-to-end encryption were subject to scrutiny by privacy advocates and academic researchers associated with institutions such as Citizens Advice and university research groups; subsequent technical analyses by researchers at universities and security firms compared Skype’s design to protocols like ZRTP and SRTP. Microsoft has implemented transport encryption, secure authentication via Microsoft account credentials, and integration with enterprise identity solutions including Azure Active Directory. Privacy controversies have involved lawful intercept capabilities, compliance with regulatory orders from authorities in jurisdictions such as United States and European Union members, and transparency discussions in forums alongside companies like Facebook and Google. Security features have included two-factor authentication options and permissions controls on mobile platforms like Android (operating system) and iOS.

Reception and impact

Industry reception has ranged from acclaim for democratizing voice and video communications—cited alongside transformative technologies like Skype Translator and innovations compared to FaceTime—to criticism over quality regressions during architecture transitions and concerns about privacy. Skype influenced academic research in multimedia communications at institutions such as MIT and Stanford University and shaped regulatory debates overseen by agencies like the Federal Communications Commission and the European Commission. Its role in enabling cross-border personal and humanitarian communications has been noted in reporting by outlets connected to BBC News, The New York Times, and The Guardian. Competitive dynamics with firms like Google, Apple Inc., Zoom Video Communications, and WhatsApp have driven ongoing feature development across the telepresence and collaboration market.

Category:Voice over IP software Category:Microsoft software