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The key thing is that you can only use an ID name once in a HTML/XHTML document as opposed to a class which you can use multiple times.

In your CSS, you must represent the ID name with a starting pound (#) sign and a class with a starting period (.)

/* an id */
#content {
    font-size: 14px;
}

/* a class */
.blogDate {
    color: #333;
}

Another thing is that an element can have multiple classes.

<span class="right big">This text is aligned right and big</span>

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