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.class and #id, what's the difference?


Rickname
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I'm quite new to coding, and have big trouble understanding the logic in even the supposedly easiest languages to learn. However, what is the functional differences between .class and #id? Is there situations where only either of them can be used? I can't see any difference by reading the W3 pages about them  (respectively https://www.w3schools.com/cssref/sel_class.asp and https://www.w3schools.com/cssref/sel_id.asp).

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So classes are more flexible ref than id. But what is special about id? I can't imaging why it exists if it only can do what classes can do, and that with narrower field of usage.

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For CSS you can target a specific singular id that refers to a specific area from a website layout ,that has multiple classes that are also used within other areas that each have a unique id.

Then by referring to this id and then the class name as in '#idref .classname'  I can change the styling of these classes, without affecting others elsewhere.

For JavaScript you can do the same to manipulate specific elements within that id identifier element only .

Simple example would be #header, #left, #right, #content, #left-aside, #right-aside, which specifically identify a specific area of your site, which you need to style and target individually.

Edited by dsonesuk
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