What do the following terms mean? SaaS PaaS IaaS? There are various cloud services available today, such as Amazon's EC2 and AWS, Apache Hadoop, Microsoft Azure and many others. Which category doe... I'm designing an app which needs to have some collaboration functionality. So 1 to many users can edit certain attributes of an event they plan together. e.g. the main-admin can change the title, picture etc. while all admin-users could change the date for example. When creating a Collaboration Diagram in Doxygen that specifies the connections between Doxygen groups, what is the meaning of a purple dashed line without an arrow? I'd like to know the differences between doing a Fork of a project and doing a clone of it. Can I only send pull requests via GitHub if I've forked a project?