What is the difference between XML, HTML, and XHTML?

What's the difference between XML, HTML, XHTML, Apache, MySQL, javascript, SSI, PHP, and CSS? I'd like to start learning how to make webpages, learn more about servers and networking, and be able to do something with the knowledge. I'm learning C++ now, but I've heard that HTML is far more simple. So...can someone fill me in on all of these different things, their differences/similarities, what you can do with them, what they are, where I may have run into them or seen them in use before, how I'd go about learning more about them, or using them (if that applies, example if something is a programming language). I'm a bit clueless now as you can see, so I'd like some info. Thanks!

XML is an extensible markup language that was developed to get the flexibility and power of HTML while reducing most of the complexity. On other hand XHTML as it name suggest that it combines the flexibility of HTML with the extensibility of XML. And the last is HTML that you know that its stands for Hyper text Markup Language, a type of language which is contains many kind of tags and texts in document to showing a running web page.

senushiya wrote:

What's the difference between XML, HTML, XHTML, Apache, MySQL, javascript, SSI, PHP, and CSS? I'd like to start learning how to make webpages, learn more about servers and networking, and be able to do something with the knowledge. I'm learning C++ now, but I've heard that HTML is far more simple. So...can someone fill me in on all of these different things, their differences/similarities, what you can do with them, what they are, where I may have run into them or seen them in use before, how I'd go about learning more about them, or using them (if that applies, example if something is a programming language). I'm a bit clueless now as you can see, so I'd like some info. Thanks!

XML: is theextensible markup language . it is basically use for the database purpose.
HTML: is hypertext markup language: it is basically used for the design the website or webpage.
xHTML: one of the type of HTML but it is used by extensibally.