Answer

hi sir,

 

you write the html code into an editor. you save it as something.html (or htm). when you double click on the html file you have created, it is opened in your browser (internet explorer etc)

 

editor = there are html editors, like dreamweaver, frontpage etc... they only makes it easy to write your code. in fact, if you know HTML enough, you can open a blank notepad (windows notepad) type your codes. save it as html. this will work too.

 

xml is the same. you write the code, and save it as something.xml. xml is helping internet applications to be able to retrieve data easily. (you don't open xml file as you do like htmls)

 

for example, you write the codes in xml for the daily updated data in your website. internet applications (like feed readers) can access your xml file, and read your data.