You can work with a variety of file types in Dreamweaver. The primary kind of file you will work with is the HTML file. HTML files—or Hypertext Markup Language files—contain the tag-based language responsible for displaying a web page in a browser. You can save HTML files with either the .html or .htm extension. Dreamweaver saves files using the .html extension by default.

Following are some of the other common file types you might use when working in Dreamweaver:

CSS

Cascading Style Sheet files have a .css extension. They are used to format HTML content and control the positioning of various page elements.

GIF

Graphics Interchange Format files have a .gif extension. GIF format is a popular web graphic format for cartoons, logos, graphics with transparent areas, and animations. GIFs contain a maximum of 256 colors.

JPEG

Joint Photographic Experts Group files (named after the organization that created the format) have a .jpg extension, and are usually photographs or high-color images. The JPEG format is best for digital or scanned photographs, images using textures, images with gradient color transitions, and any images that require more than 256 colors.

XML

Extensible Markup Language files have a .xml extension. They contain data in a raw form that can be formatted using XSL (Extensible Stylesheet Language).

XSL

Extensible Stylesheet Language files have a .xsl or .xslt extension. They are used to style XML data that you want to display on a web page.

CFML

ColdFusion Markup Language files have a .cfm extension. They are used to process dynamic pages.

ASPX

ASP.NET files have a .aspx extension and are used to process dynamic pages.

PHP

Hypertext Preprocessor files have a .php extension and are used to process dynamic pages.