(Extensible Markup Language) is a markup language similar to HTML, but without predefined tags to use. Instead, you define your own tags designed specifically for your needs. This is a powerful way to store data in a format that can be stored, searched, and shared. Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The World Wide Web Consortium's XML 1.0 Specification of 1998[3] and several other related specifications all of them free open standards—define XML. This course is dedicated to learn the basics of XML.XML stands for EXtensibleMarkupLanguage. itwas designed to store and transport data. itwas designed to be both human- and machine-readable.XML plays an important role in many IT systems. For this reason, it is important for all software developers to have a good understanding of XML. Before you continue, you should also have a basic understanding of HTML CSS and Javascript . in this course you will learn the theoretical concepts of basics of XML . this is a beginners level course and this course is not for experts in XML