Correct Answer: Doctype helps the web browser to correctly render the web pages There are different types of Doctype that are available and they are as follows: => Strict Doctype: it consists of all the HTML elements and it is also known as DTD (Document type definition) but it doesn't include the presentational and deprecated elements ie font, center, etc Framesets related elements are also not allowed in this For example: => Transitional Doctype: it consists of all the HTML elements and attributes It is also known as DTD (Document type definition) It includes the presentational and deprecated elements ie font, center, etc Framesets related elements are also not allowed in this For example: => Frameset Doctype: it consists of all the HTML elements and attributes It is also known as DTD (Document type definition) It includes the presentational and deprecated elements ie font, center, etc Framesets related elements are also allowed in this For example: