Internet

Internet
Name	Internet
Caption	A visualization of routing paths through a portion of the Internet
Launch date	1983 (public availability)

Internet. The Internet is a global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries a vast range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and file sharing.

History

The foundational concepts for the Internet originated in the 1960s with research into packet switching commissioned by the United States Department of Defense's Advanced Research Projects Agency (ARPA). The ARPANET, a pioneering network using these protocols, was established in 1969, with key nodes at institutions like the University of California, Los Angeles and the Stanford Research Institute. The development of the Transmission Control Protocol and Internet Protocol in the 1970s, often credited to researchers like Vint Cerf and Bob Kahn, provided the essential standardized communication rules. The network expanded to include other academic and research networks, such as NSFNET, and the creation of the World Wide Web by Tim Berners-Lee at CERN in 1989 revolutionized access to information. The decommissioning of the ARPANET in 1990 and the lifting of restrictions on commercial use by the National Science Foundation paved the way for the modern, global Internet.

Infrastructure

The physical infrastructure of the Internet consists of a complex hierarchy of interconnected components. At its core are high-capacity fiber-optic cables that form the global Internet backbone, spanning continents and oceans, operated by major carriers like AT&T and Deutsche Telekom. These connect to regional and local networks through Internet exchange points, such as the DE-CIX in Frankfurt. Access for end users is provided by Internet service providers (ISPs) using technologies including digital subscriber line (DSL), cable modems, fiber to the x (FTTx), and satellite Internet access. Critical to directing traffic are routers and network switches, while data centers operated by companies like Google and Amazon Web Services host the servers that provide content and services.

Governance and regulation

Internet governance is a decentralized and multi-stakeholder model, involving technical coordination, policy development, and legal frameworks. Key technical bodies include the Internet Engineering Task Force (IETF), which develops protocol standards, and the Internet Corporation for Assigned Names and Numbers (ICANN), which manages the Domain Name System (DNS) and IP address allocation. Policy and legal regulation vary significantly by nation-state; for example, the European Union enforces the General Data Protection Regulation (GDPR), while other countries like the People's Republic of China maintain extensive controls through mechanisms like the Great Firewall. International debates often involve organizations like the International Telecommunication Union (ITU) and address issues of net neutrality, exemplified by policies from the Federal Communications Commission in the United States.

Services and applications

The Internet hosts a vast ecosystem of services and applications built upon its fundamental protocols. The World Wide Web, accessed via web browsers like Google Chrome and Mozilla Firefox, is the most prominent, comprising interconnected sites and platforms such as Wikipedia, YouTube, and Amazon. Electronic mail remains a critical communication tool, while instant messaging and Voice over IP services like WhatsApp and Zoom Video Communications facilitate real-time interaction. Other major applications include file sharing protocols, streaming media services like Netflix, and cloud computing platforms provided by Microsoft Azure and others. The rise of Web 2.0 enabled participatory platforms like Facebook and Twitter.

Social impact

The Internet has profoundly transformed global society, economics, and culture. It has revolutionized commerce through the rise of e-commerce giants like Alibaba and eBay, and reshaped media consumption and journalism. Social networking platforms have altered interpersonal communication, political mobilization, and public discourse, evident in events like the Arab Spring. It has increased access to information and education through resources like the MOOCs from edX, but also contributed to challenges such as the spread of misinformation and digital divides between regions with differing access. The Internet has also created new forms of cultural expression and communities.

Security and privacy

As the Internet has grown, so have concerns and challenges related to security and individual privacy. Malicious threats are pervasive, including computer viruses, ransomware attacks like WannaCry, phishing scams, and denial-of-service attacks often orchestrated by botnets. Protecting infrastructure and data involves technologies such as firewalls, encryption (e.g., Transport Layer Security), and practices by computer security teams at organizations like the CERT Coordination Center. Privacy issues are central, involving data collection by corporations like Meta and state surveillance programs, leading to legal and ethical debates and the promotion of tools like Tor and Signal for enhanced anonymity and secure communication.

Category:Internet Category:Computer networks Category:Digital technology Category:Information Age