[DUPLICATE] what is difference between #id and . class

Answer 1

https://www.sololearn.com/discuss/706160/?ref=app
https://www.sololearn.com/discuss/519080/?ref=app
https://www.sololearn.com/discuss/91160/?ref=app
https://www.sololearn.com/discuss/401169/?ref=app
https://www.sololearn.com/discuss/1004409/?ref=app

Answer 2

Unlike the id selector, the class selector is most often used on several elements. This allows you to set a particular style for many HTML elements with the same class. The class selector uses the HTML class attribute, and is defined with a "." id is used when we have to apply CSS property to one attribute only

ID's are unique
Each element can have only one ID
Each page can have only one element with that ID

Classes are NOT unique
You can use the same class on multiple elements.
You can use multiple classes on the same element.