Difference between the uses of id attribute and a class

How is an id attribute different from the use of a class? How do we understand when to use a class or an id attribute?
And also is for attribute only used with label element ? It also has a similar use,don’t it?

An id attribute should be unique. So you should not have two elements with the same id. id attributes can be used for styling CSS, but are most commonly used for JavaScript.

A class can be assigned to multiple elements. A class is very useful for CSS styling, as it allows you to apply the same style to all elements with the same class. Generally you want each class to correspond with each style.

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