What is HTML, CSS and XML?

HTML stands for Hyper Text Markup Language is a text file or ASCII file that contains instructions / scripts to the web browser to display a graphical view of a web page. In the HTML file there are several "tags" or codes understood by the web browser and can be displayed on the screen.

HTML files can be created with any text editor application on any operating system, such as: Notepad in Windows, emasc or vi on Unix or SimpleText on the Macintosh. This HTML file can also be created in any word processing application provided that when saving files are stored in text-only format.

One of the advantages the HTML file is cross platform, meaning that HTML files can be displayed on several Operating Systems (OS) are different and have the same view even when making use of a particular OS.

CSS stands for Cascading Style Sheets. It is a stylesheet language that acts as the presentation layer for markup languages such as HTML and XHTML. The presence of CSS allows us to separate the layout component from the information component. In essence, the HTML document becomes the information component, while the CSS Style Sheet becomes the layout component.

CSS used to be something that only a webmaster would need to learn. With the advent of blogs, however, CSS is fast becoming a computer language that reaches the masses. Whether you downloaded your own blog software or you are using one of the blog service providers such as Blogger and Wordpress, chances are good that you'll need to modify the CSS stylesheet at least a little bit if you want to give your blog a personal touch, and this tutorial is the ideal place to learn CSS.

XHTML is a combination of HTML and XML (Extensible Markup Language). Ato XHTML Extensible HyperText Markup Language is a perfect form (in a sense, more strict and clear than HTML). The purpose is to replace HTML XHTML. XHTML is HTML defined as an XML application which means that XHTML contains all the elements in HTML 4.01 combined dengna XML syntax.

XML is a markup language where everything must be made with care so as to produce a document that "well-formed". XML is designed for describing the data, while HTML is designed to display data. The development of browser technology, which the browser is not only in the computer, but also in mobile phones and PDAs, raises the need for a standardized script and free from error.

The combination of HTML and XML, known as XHTML using the strict rules in terms of writing. XHTML pages can be read on devices that support XML. XML brings good luck because it can present the document "is well-formed" and can be support in many browsers.

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