HTML stands for Hypertext Markup Language – a code that’s used to create the structure for a web page and its content.
This markup language is comprised of a series of elements that used to make content appear or function a certain way and is a major part of the front-end code of every website.
As the name suggests, HTML5 is the fifth version of the HTML standard. It supports the integration of video and audio into the language, which reduces the need for third-party plugins and elements.
HTML5 is the most up-to-date HTML code. It is fast and reliable and can serve to all major browsers.
Properly written, HTML5 sites are the cleanest and fastest possible websites. SPEED is a major factor in Googles website ranking. HTML5 websites that are properly written give you a huge advantage in ranking.
HTML5 is used to dictate the structure and content that will be displayed.
CSS is used for the modification of the site design such as the layout, visual effect, text size and color, background color, and just about every aspect of the site. This is the 'styling' of the site.
PHP is a code language that allows for server side development and control of a website.
PHP allows information that is used on all pages (like the header, the menu, the footer) to be loaded when the site is first displayed and then re-used without reloading on each page view. This makes your website much faster giving you much better ranking on the seach engines.