What is HTML?
Hyper Text Markup Language is the standard markup language for the documents designed or coded to be displayed in a web browser.
What is the use of HTML?
Its main use is to design the document page which is displayed in the web browser. Since it provides you with many features like you can create the table, you can create frame, you can add images etc. Later on you will come to know the features of HTML.
Like you can see whatever code I have written in the left side (notepad) the output of the code is in the right side(web browser). This is the small example of the HTML.

The <!doctype>Element
The <! doctype> elements is the first element in the HTML document, which is placed above the <html> tag. The <! doctype> declaration specifies the Document Type Definition (DTD).
The <html> Element
The <html> element is the HTML element that actually starts an HTML document. It contains everything an HTML document contain except the <! doctype> element.
The <head> Element
The <head> element generally contains the information about the HTML document, such as its title, search keyword for search engine and base address for URLs.
The <title> element
The <title> element contains the title of the HTML document, which will appear in the title bar of the web browser and is used by search engines for referring to the document.
The<body>Element
The <body> element contains the body of the HTML document, which includes the entire content that will appear in the Web browser.