SQL Server is a relational database management system (RDBMS) developed and marketed by Microsoft. As a database server, the primary function of the SQL Server is to store and retrieve data used by other applications.
Learn About SQL Server

SQL Server is a relational database management system (RDBMS) developed and marketed by Microsoft. As a database server, the primary function of the SQL Server is to store and retrieve data used by other applications.
We can install SQL Server update and previous version from the microsoft website (https://www.microsoft.com/en-us/sql-server/sql-server-downloads). For more information you can show video below
Please click on this URL *SQL-Website* for Installation of SQL Server-2014