XHTML creates a document with tags. And that’s important. For example:
Normal text <strong> emphasized text </ strong>
What I wrote is now XHTML source code. The source code is written in a text editor (or Web page editor) and stored with the extension .html or .htm, such a document is then opened in an Internet browser (Internet Explorer, Mozilla Firefox …) And what is most important.
At the beginning of the bold text to insert a <strong> at the end of the closing </ strong>, the backslash is used to determine that it is a closing tag. Delimited text, including tags is called an element or element. Symbols are always written in small letters!