Html is a markup language not a programming language as it is not able to build logic like programming languages.Html is used to create web pages or structure of the website or skeleton of the website as it is easy and simple to use .The biggest advantage of html is that it is allowed to run on most of the web browser and is free.If we simply say about html it means we are talking about older version of html.in older version of html readability is somewhat difficult that is we can't easily distinguish between header, article ,footer and section and if we make mistake it would become difficult to find out and took time so latest version of html came into existence that is html5 is the latest version as it contain semantic tags .Semantic tags are those tags which are self explanatory that is header it defines the head main it defines the main content of the body article tag the article of the body details tag represent details.As semantic tags increases readability we can easily identify our mistake by knowing the tags and correct them.html5 is used in web applications ,e-commerce website etc.