Skype

Skype
Skype Technologies · Public domain · source
Name	Skype
Developer	Microsoft
Released	2003
Latest release	2025
Operating system	Microsoft Windows, macOS, Linux, Android, iOS
Genre	Voice over IP, instant messaging, video conferencing
License	Freemium, proprietary

Skype is a telecommunications application that provides voice calls, video calls, instant messaging, and file transfer across the Internet. Launched by entrepreneurs and developed through a series of corporate acquisitions, the service became notable for peer-to-peer voice over IP technology, a global subscriber base, and integration with desktop and mobile ecosystems. Over its lifespan it intersected with major technology companies, regulatory bodies, and competing platforms in the communications sector.

History

The project originated with entrepreneurs who previously worked on peer-to-peer products and was launched by a team that included developers associated with projects such as the file-sharing client KaZaA and companies like Estonia-based startups. Early funding and growth attracted investors including Index Ventures and eBay, before acquisition by Silver Lake Partners and eventual purchase by Microsoft in 2011. Post-acquisition, integrations linked the service with Microsoft Office, Outlook.com, and later with enterprise offerings from LinkedIn connections and Azure cloud services. Over time, the product competed with services from Google, Apple Inc., Facebook, Amazon (company), and conferencing platforms developed by Cisco Systems and Zoom Video Communications. Major milestones included expansions into mobile via partnerships with Nokia and handset manufacturers, regulatory scrutiny from agencies such as the European Commission, and adjustments following the rise of social platforms like Twitter and WhatsApp Messenger.

Features and technology

The application implemented voice over IP, video codecs, and instant messaging using proprietary and open-source libraries, integrating codecs referenced by standards bodies like the Internet Engineering Task Force. Early architecture leaned on peer-to-peer routing and supernode concepts pioneered by projects such as Gnutella and BitTorrent. Multimedia features included integration with webcams from vendors like Logitech International and microphones supported by audio hardware vendors such as Creative Technology. Screen sharing and conference calling paralleled features in enterprise products from Poly (formerly Plantronics and Polycom) and conferencing suites by Citrix Systems. Security mechanisms referenced cryptographic primitives standardized by organizations like the National Institute of Standards and Technology and compliance norms observed in telecommunications by firms such as AT&T and Verizon Communications.

Platforms and availability

Client applications and web interfaces were developed for desktop platforms including Microsoft Windows, macOS, and various Linux distributions, alongside mobile apps for Android and iOS. Distribution channels included app stores operated by Google LLC and Apple Inc. as well as bundled installs on devices sold by OEMs such as Dell Technologies and HP Inc.. Browser-based access interacted with web standards promoted by the World Wide Web Consortium and browser vendors like Mozilla Foundation and Google Chrome. Regional availability was subject to regulations in countries like China and Russia, and enterprise deployments were often integrated with directory services such as Active Directory and unified communications platforms from Microsoft Teams and Skype for Business predecessors.

Business model and licensing

The service employed a freemium model offering free person-to-person calls and paid services including outbound calls to traditional telephone networks via partnerships with carriers like BT Group and interconnection agreements with incumbents such as Deutsche Telekom. Licensing and enterprise editions referenced commercial contracts similar to those for platforms by Avaya and RingCentral. Monetization channels included subscription plans, pay-as-you-go credit bundles, and bundling with services from Microsoft 365 and consumer offerings distributed by retailers like Amazon (company). Intellectual property and patent matters intersected with portfolios held by companies such as Skype Technologies S.A. origins and disputes comparable to matters litigated by Qualcomm and Nokia.

Market reception and usage

Adoption metrics placed the service among widely used Internet telephony offerings alongside WhatsApp Messenger, WeChat, Viber, and products from Google such as Google Meet. Analysts from firms like Gartner and Forrester Research examined user trends relative to platforms including Zoom Video Communications and corporate suites from Cisco Systems. Consumer uptake was boosted by bundled integrations with devices from Samsung Electronics and service promotions via carriers such as T-Mobile US. Competitive dynamics involved regulatory filings to entities like the Federal Communications Commission and market responses from rivals including Facebook Messenger and startups in the VoIP space.

Privacy, security, and legal issues

The platform faced scrutiny over interception, data retention, and lawful access in contexts involving agencies such as the Federal Bureau of Investigation and national regulators like the Information Commissioner's Office in the United Kingdom. Security researchers from institutions including University of Cambridge and companies like Kaspersky Lab analyzed vulnerabilities and cryptographic implementations, prompting updates aligned with guidance from standards bodies such as the Internet Society. Legal disputes over jurisdiction, data requests, and antitrust concerns involved courts and regulators including the European Court of Justice and competition authorities like the European Commission. Compliance with privacy frameworks referenced legislation such as the General Data Protection Regulation in the European Union and oversight by national data protection authorities.

Category:VoIP software