For more information, take a look at Web Page Creation - HTML Editors. HTML files are saved with the extension .htm or .html - it's best to use the three letter extension for maximum compatibility with all systems. The text contains special commands, called tags, which instruct the browser to display a certain thing on the screen. Images, sounds and other such files are completely separate, but must be present in order for the Web page to work properly. It is also known as an element.
Some elements also have certain attributes, which affect the behaviour of the element.
These attributes can be given values which make them do different things. Note that there may be other attributes available for this element, but because they are not mentioned then they remain with default values. This tells the browser that it is reading an HTML tag and it shouldn't display this on the screen. After the initial tag, there is another, smaller tag, which looks similar but has a forward slash before the tag name. This is called the closing tag.