What is the difference between class and id in HTML?

• In HTML, id is unique whereas class is not.
• An HTML element can't have more than one id but it can have more than one class. 
• Two or more elements in an HTML page can't have the same id but can have the same class.
• The priority of id is higher than that of class in HTML web page. 

ID - Id always a unique, in HTML webpage we can call only one time in a whole page BUT

Class - Class is not unique, we can call the same class many times in the HTML web page.