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In CSS (Cascading Style Sheets) you can use both "id" and "class" to select elements to style. For example, you can use:
Unlike the id selector, the class selector is most often used on several elements. This allows you to set a particular style for many HTML elements with the same class. The class selector uses the HTML class attribute, and is defined with a "." A simple way to look at it is that an id is unique to only one element.
In Simple Word:
A class is a type of item and the id is the unique name of an item on the page.
Examples of ids are: main-content, header, footer, or left-sidebar.
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Here's how I remember it. Class is meant to design several elements. And id is used for unique elements which appear specifically in some points. You may find that reusing id elements often lead to issues when you wish to recurring use them. If you are planning to use them recurring then go with the class. That's how you can have the uniform and non breaking design with CSS.