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Probably the most misused thing in CSS are classes and IDs. People just don’t know when to use which.

An ID is a unique identifier. Say if I want my navigation menu to have the ID nav, no other element will have the nav id. A class is, in my words, a definition for how something looks. Say you want everything in multiple IDs to have green text, well you wouldn’t assign all those elements the same ID, you would assign them the same class.

In a nutshell, ID = unique, class = multiple, formatting.