HTML is a tagged language. What this means is that it uses tags to mark the where and how of layout, appearance, or object.
For example, if you wanted some text to be bold face, you would place an opening bold tag before the text, and a closing bold tag after the text. It would look something like this:
<b>This text will be in bold face</b>Notice that the closing tag looks just like the opening tag, except for the forward slash. This is an example of a paired tag, meaning that there is a matching closing tag.
Not all tags are paired. As a general rule, tags that insert multimedia elements are not paired.
Not all paired tags require the closing tag. Paired tags that require the closing tag will be noted when they are introduced.
Some tags have modifiers that further define how the tag works. These modifiers are known as attributes. Attributes go inside the opening tag, and are assigned a value. The attributes for a tag will be discussed when the tag is introduced.
Three very important things to understand about HTML documents: