Terahertz (THz) is a unit of measure of frequency that is equal to 1 trillion hertz (1012 Hz). It usually refers to the frequency of an electromagnetic wave, which is a part of the electromagnetic spectrum invisible to the naked eye that lies in between the microwave and the infrared range. T-rays are an example of a specific part of the spectrum...
Hypertext markup language (HTML) is the major markup language used to display Web pages on the Internet. In other words, Web pages are composed of HTML, which is used to display text, images or other resources through a Web browser.
All HTML is plain text, meaning it is not compiled and may be read by humans. The file extension for an HTML file is .htm or .html.
When a Web developer builds an application, the work is performed on the server, and raw HTML is sent out to the user. The line between server-side development and client side development is blurry with technologies like AJAX.
HTML was never designed for the Web that exists today, as it is just a markup language with severe limitations, in terms of control and design. Numerous technologies have been used to work around this issue - the most significant being cascading style sheet (CSS).
The long term solution is (or hopefully will be) HTML5, which is the next generation of HTML and allows for more control and interactivity. As with any development on the Web, the move to standards is a slow and arduous process, and Web developers and designers have to make due with current and supported technologies, which means that basic HTML will continue to be used for some time.
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