title: Are all web pages HTML?
body: <p>I see all these tools for web page creation. (Java, PHP , ASP.NET , CSS, WordPress...) When I save a web page, it's always HTML. Does that mean that all these tools are platforms for creating HTML web pages? Or are they alternatives to HTML altogether?</p>
  
  <p>Also, if they <em>are</em> all HTML, why do web hosts advertise they have Linux / Windows? What does it matter?</p>