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CSS selectors are what allows us to target specific Html Elements and apply styles in the declaration block to them. The biggest key player in understanding CSS is understanding selectors and how they work. The universal selector is donated by an asterisk and selects all elements regardless of their type present on the page. The class selector is probably the most useful and versatile selector, it selects elements that have given the class value in their class attribute. The ID selector is the most powerful in terms of CSS specificity, just like the class selector, targets specific elements in our markup.