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Some websites require user registration or subscription to access content.
Examples of subscription websites include many business sites, news websites, academic journal websites, gaming websites, file-sharing websites, message boards, web-based email, social networking websites, websites providing real-time stock market data, as well as sites providing various other services.
Images are commonly used to effect the desired appearance and as part of the main content.
As of 2017, end users can access websites on a range of devices, including desktop and laptop computers, tablet computers, smartphones and smart TVs.
Before the introduction of HTML and HTTP, other protocols such as File Transfer Protocol and the gopher protocol were used to retrieve individual files from a server.
These protocols offer a simple directory structure which the user navigates and chooses files to download.
Documents were most often presented as plain text files without formatting, or were encoded in word processor formats.