Github is a hosting website for Software development projects that uses Git revision control system. It is free for all and you can host your projects there. Github has a feature called Github Pages to host your personal website on Github Repository. You can host your HTML, CSS and JS website on Github. It does not support php websites.What is GitHub request?
Pull Request is the way Github provides for author of the code to share his/her code with others, and to allow others to take a look at your code before you merge it to integration branch and leave comments.