What is the difference between div class and the id of the div

I managed to achieve a css colum two in my content.  I usually use "div id" but when I did my two columns he worked (for me anyway) if the content was a 'class' and a 'div' of the content of the right.  Why is this? Is this bad?

This is my code

. Happy {}

height: 400px;

Width: 300px;

background-color: #FF0;

float: left;

}

{#rightcontent}

Width: 694px;

background-color: #0FF;

float: right;

height: 400px;

}

If I try to have content like "id", he disappears.

Thank you in advance.  Karen

A class is reusable as many times as you want per page.  An ID is a unique name that can be used only once per page.

{#IDName}

. ClassName {}

I'm unique!

I am re-usable.

Nancy O.

Tags: Dreamweaver

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