What is the difference between id and class in HTML?

An id must be unique, so it identifies only one element on the page. A class can be used on many elements, and one element can have many classes.

Point	id	class
Elements	Only one	Many
CSS selector	#name	.name
Many on one element	No	Yes, separated by a space

<style>
  #title { color: navy; }
  .note  { background: #fff3cd; }
</style>

<h1 id="title">Heading</h1>
<p class="note">Note one</p>
<p class="note">Note two</p>

An id is also used as the target of a link (#id). See HTML Class and ID.

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