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User agent

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On the Web, a user agent is a software agent responsible for retrieving and facilitating end-user interaction with Web content. This includes all web browsers, such as Google Chrome and Safari, some email clients, standalone download managers like youtube-dl, and other command-line utilities like cURL. The user agent is the client in a client–server system. The HTTPUser-Agent header is intended to clearly identify the agent to the server.

Email clientEmail clientAn email client, email reader, message user agent (MUA), or mail user agent is a computer program used to access and manage a user's email. A web application which provides message management, composition, and reception functions may act as a webmail client, and a piece of computer hardware or software whose primary or most visible role is to work as an email client may also use the term.Software agentSoftware agentIn computer science, a software agent is a computer program that acts for a user or another program in a relationship of agency. The term agent is derived from the Latinagere (to do): an agreement to act on one's behalf. Such "action on behalf of" implies the authority to decide which, if any, action is appropriate. Some agents are colloquially known as bots, from robot.Safari (web browser)Safari (web browser)Web browser by AppleWritten inC++Cassembly languageObjective-CJavaScriptEnginesWebKitJavaScriptCoreOperating systemmacOSiOSiPadOSWindows (2007–2012)visionOSIncluded withmacOSiOSiPadOSvisionOSTypeWeb browserLicenseFreeware (pre-installed on Apple devices); some components GNU LGPLWebsiteapple.com/safariSafari is a web browser developed by Apple.Web browserWeb browserA web browser, often abbreviated as browser, is an application for accessing websites. When a user requests a web page from a particular website, the browser retrieves its files from a web server and then displays the page on the user's screen. Browsers can also display content stored locally on the user's device. Browsers are used on a range of devices, including desktops, laptops, tablets, smartphones, smartwatches, smart televisions and consoles.Google ChromeGoogle ChromeGoogle Chrome is a cross-platform web browser developed by Google. It was launched in September 2008 for Microsoft Windows, built with free and open-source (FOSS) components from Apple WebKit and Mozilla Firefox. Versions for Linux, macOS, iOS, iPadOS, and Android were later released, and Chrome became the default browser on Android devices. It is also the main component of ChromeOS, on which it serves as the platform for web applications.Client–server modelClient–server modelThe client–server model is a form of messaging pattern in a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients. Often clients and servers communicate over a computer network on separate hardware, but both client and server may be on the same device. A server host runs one or more server programs, which share their resources with clients.Download managerDownload managerA download manager is a type of software that manages the downloading of files from the Internet, which may be built into a web browser, or as a stand-alone program.Youtube-dlYoutube-dlyoutube-dl is a free and open-source software tool for downloading video and audio from YouTube and over 1,000 other video hosting websites. It supports diverse file formats, quality settings, and platforms including Microsoft Windows, macOS, and Linux. It is released under the Unlicensesoftware license. As of September 2021, youtube-dl is one of the most starred projects on GitHub, with over 100,000 stars.World Wide WebWorld Wide WebThe World Wide Web (also known as WWW, W3, or simply the Web) is a global interconnected information system that enables content sharing over the Internet. It facilitates access to documents and other web resources according to specific rules of the Hypertext Transfer Protocol (HTTP). The Web was invented by English computer scientist Tim Berners-Lee while at CERN in 1989 and opened to the public in 1993. It was conceived as a "universal linked information system".CURLcURL (pronounced like "curl", ) is a free and open-source computer program for transferring data to and from Internet servers. It can download resources identified by URLs from a web server over HTTP and supports a variety of other network protocols, URI schemes, multiple versions of HTTP, and proxying. The project consists of a library (libcurl) and command-line tool (curl), which have been widely ported to different computing platforms.End userEnd userIn product development, an end user is a person who ultimately uses or is intended to ultimately use a product. The end user stands in contrast to users who support or maintain the product, such as sysops, system administrators, database administrators, information technology (IT) experts, software professionals, and computer technicians.Command-line interfaceCommand-line interfaceA command-line interface (CLI), also known as a command-line shell, is a means of interacting with software via commands – each formatted as a line of text. The concept of interacting with a computer via text evolved over two decades, transitioning from physical hardware to sophisticated software. Before the CLI, computers were programmed using physical switches or punched cards. The shift toward a "command" style interaction began with the use of Teleprinters (Teletypes).

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