Shivapandian wrote:

HTML elements are the basic building blocks of webpages. HTML standard were and are created by World Wide Web consortium (W3C).
HTML5is markup language for structuring and presenting content for the World Wide Web, and is a core technology of the Internet originally proposed by Opera Software.

Among to the all answers I found satisfactory and easily understandable response in briefly which is helpful to non-developers people for a knowledge.