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A router is a networking device that forwards data packets between computer networks.

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The purpose of a mail server is to provide a method of routing and storing emails which are being sent and received. Every email passes through an outgoing and incoming email server.

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A web server’s main purpose is to store web site files and broadcast them over the internet for you site visitor’s to see. In essence, a web server is simply a powerful computer that stores and transmits data via the internet.

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A PC (desktop/workstation) is designed for human-to-computer interaction. It is expendable, short-lived and heavily influenced by media, trends, marketing and so on. The same applies to smartphones, tablets and other devices nowadays.A server is designed for computer-to-computer interaction.                                 A server has only one interface to the outside world that matters -- the network interface. A server is designed to be centrally manageable, robust and reliable under high load for years.

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A PC (desktop/workstation) is designed for human-to-computer interaction. It is expendable, short-lived and heavily influenced by media, trends, marketing and so on. The same applies to smartphones, tablets and other devices nowadays.A server is designed for computer-to-computer interaction.                                 A server has only one interface to the outside world that matters -- the network interface. A server is designed to be centrally manageable, robust and reliable under high load for years.

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On the Internet the dominant operating systems among servers are UNIX-like open source distributions, such as those based on Linux and FreeBSD, with Windows Server also having a very significant share. Proprietary operating systems such as z/OS and macOS Server are also deployed, but in much smaller numbers.

Since servers are usually accessed over a network, many run unattended without a computer monitor or input device, audio hardware and USB interfaces. Many servers do not have a graphical user interface (GUI). They are configured and managed remotely.

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How a router is connected to a computer system:

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How a router is connected to a computer system:

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The POP (Post Office Protocol) is used to handle incoming emails by storing them locally on the device they are being accessed from.

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It is a data table stored in a router or a networked computer that lists the routes to particular network destinations, and in some cases, distances associated with those routes. It carries information about the topology of the network immediately around it.

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The Internet Message Access Protocol stores emails on a server, meaning the messages can be accessed and synchronised between multiple devices.

Simple Mail Transfer Protocol is used to handle outgoing emails

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An email client is used to download emails from an email server and store them locally on the machine they are being accessed from.

Examples include:
MS Outlook
Mozilla Thunderbird
Mailbird

Email clients are particularly useful for organising multiple email accounts in one place.

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Tim Berners-Lee

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A browser is a software application for retrieving, presenting and traversing resources on the world wide web.

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A web browser (commonly referred to as a browser) is a software application for retrieving, presenting and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI/URL) that may be a web page, image, video or other piece of content.

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Web mail services allow users to access messages online through a web-based interface. A disadvantage of this is that an Internet connection is required to view messages, as they are not stored offline.

Examples Include:
Gmail
Hotmail
Yahoo!

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Internet explorer
Firefox
Google chrome
Microsoft edge
Safari
Sogou Explorer

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What was the name of the first web browser 

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What was the name of the first web browser 

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The first graphical web browser to become truly popular and capture the imagination of the public was NCSA Mosaic.