Bootstrap is a free and open-source front-end web framework for designing websites and web applications. It contains HTML- and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions.

Responsive Web design is the approach that suggests that design and development should respond to the user's behavior and environment based on screen size, platform and orientation. The practice consists of a mix of flexible grids and layouts, images and an intelligent use of CSS media queries.

SEO or Search Engine Optimization is the name given to activity that attempts to improve search engine rankings. In search results Google displays links to pages it considers relevant and authoritative. Authority is mostly measured by analysing the number and quality of links from other web pages.In simple terms your web pages have the potential to rank in Googleâ„¢ so long as other web pages link to them.