jQuery borrows the conventions from CSS for referring to id and class names. To select by id, use the hash symbol (#) followed by the element’s id, and pass this as a string to the jQuery function:
$(‘#celebs’)
You should note that the string we pass to the jQuery function is exactly the same format as a CSS id selector. Because ids should be unique, we expect this to only return one element. jQuery now holds a reference to this element.
Similarly, we can use a CSS class selector to select by class. We pass a string consisting of a period (.) followed by the element’s class name to the jQuery function: $(‘.data’)
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