What is sql server 2008 r2 express?

SQL Server 2008 R2 Express is a free version of the full SQL Server 2008 R2 database management system. It is designed for small-scale database applications and is limited in functionality compared to the full commercial version. SQL Server 2008 R2 Express supports databases that are up to 10 GB in size and can be installed on a single server or client computer. It includes several features such as support for stored procedures, triggers, views, and user-defined functions. Other noteworthy features include the ability to backup and restore databases, manage security settings, and automate tasks using SQL Server Agent. SQL Server 2008 R2 Express is also compatible with different programming languages such as C++, C#, VB.NET, and ASP.NET.