HTML5
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HTML5 is the core markup language of the internet used in creating and presenting content on the web. It is the latest framework used as determined by the World Wide Web Consortium. The previous version (HTML4) was approved in 1997.
While the language has existed for several decades, many of the new features to HTML5 are mobile and motion driven. New site utalizing HTML5 have capabilities to fit on any size screen. There are also many features for video and vector graphics. HTML5 code is also organized differently into different tags.
» An example of HTML code divided up into sections.
CSS3 is the latest version of CSS (cascading style sheets). It brings many of the stylized features of print layout to the web.
CSS brings visual elements to life by applying style to flat HTML code. By linking a certain element in HTML code to a style, the developer is able to add drop shadows, stroke, fonts, and more.
» An example of CSS code. Each of the different sections of a site, has stylized elements attached to it.
For more information, see the below resources.

CSS Tutorials: http://www.w3schools.com/css/
HTML Tutorials: http://www.w3schools.com/html/default.asp
CSS3