The Community Technology Preview (CTP) is an early version of a Microsoft product that is released to testers during the software development process. Microsoft releases several CTPs for each product, adding new features, updating pre-existing ones and fixing bugs with each release.
Microsoft SQL Server is a relational database management system, or RDBMS, that supports a wide variety of transaction processing, business intelligence and analytics applications in corporate IT environments
SQL Azure is Microsoft’s cloud database service.
SQL Server 2014 is relational database management system (RDBMS) designed for the enterprise environment.