AlwaysOn Availability Groups is a database mirroring technique for Microsoft SQL Server that allows administrators to pull together a group of user databases that can fail over together.
A columnstore index is a type of index used to store, manage and retrieve data stored in a columnar format in a database.
A database is a collection of information that is organized so that it can be easily accessed, managed and updated.
Microsoft SQL Server Parallel Data Warehouse (SQL Server PDW) is a pre-built data warehouse appliance that includes Microsoft SQL Server database software, third-party server hardware and networking components.
A relational database management system (RDBMS) is a program that lets you create, update, and administer a relational database.