If you’ve spent any time among web programmers, you’ve likely heard them mention XML as a component of current web technology. XML stands for Extensible Markup Language, which is similar in many ways to HTML, or Hypertext Markup Language. Even those who don’t make their careers in web programming are probably familiar with this language, used to display content on a web page. HTML language works by communicating to the browser how information should be displayed. XML is different in that the information encoded can be processed as data or be displayed like HTML.

Let’s look at an example to make this definition clearer. Say you put the word “zip” in tags, meaning the following data is a zip code. Put the word “zip” in tags, meaning the data in the tags is a zip code. The XML file can be used different ways, including being processed as data by another program or stored as data on another computer, or be displayed on a web page.

XML and HTML are used together often in web pages, with XML markup often appearing within an HTML page. The “extensible” part of XML means that markup symbols are self-defined and unlimited. The result is great flexibility, a good reason why it is a preferred language among web programmers.

If you have an interest in web development, time is well-spent learning XML. The language is continually developing, but is already widely used in blog newsfeeds, weather services, and e-commerce sites. XML manages and transmits data, and the browser displays that data. In addition, XML is often used to “package” data, which allows for transfer between systems that might otherwise be unable to communicate. Think of it as a virtual “envelope,” used to transmit data identity and structure. If web development is in your future, the benefits of learning XML should be pretty clear!