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How is XML used and interpreted?

I understand that XML is used to communicate between two applications using custom tags.

I did some research and found many XML tutorials, but did not describe where to use XML.

I understand that XML is famous for being user friendly. By this I mean that you can define your own tags. But I wonder where and how are these tags interpreted?

Tell me where to use XML and how to interpret the meaning of an XML file so that I can understand its basics and use it effectively.

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Your difficulty in understanding where XML fits into the big picture is general.

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<config logdir="/var/log/foo/" debugfile="/tmp/foo.debug">
    <server name="sahara" osname="solaris" osversion="2.6">
      <address>10.0.0.101</address>
      <address>10.0.1.101</address>
    </server>
    <server name="gobi" osname="irix" osversion="6.5">
      <address>10.0.0.102</address>
    </server>
    <server name="kalahari" osname="linux" osversion="2.0.34">
      <address>10.0.0.103</address>
      <address>10.0.1.103</address>
    </server>
  </config>
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Your question sounds like you are comparing XML with html and wondering how the browser can guess the value of self-defined tags. This is actually impossible. You have to write a translation of the script in XSLT and attach it to your XML file (e.g. XML Outputting - PHP vs JS vs Anything Else? ). Of course, XML is not just a tool to add a translation step. In this case, it will be used when you want to create HTML pages from raw data.

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