SQL Server is Microsoft's relational database management system (RDBMS), queried with T-SQL, Microsoft's dialect of SQL. It runs on Windows and Linux, and Azure SQL Database runs the same engine in the cloud. Its main components are:
The Database Engine, the core service for storing, processing and securing data.
SQL Server Agent, for job scheduling and automation.
SQL Server Integration Services (SSIS), for data integration and transformation.
SQL Server Analysis Services (SSAS), for analytical models. Its data mining feature was discontinued in SQL Server 2022.
SQL Server Reporting Services (SSRS), for reports. From SQL Server 2025, on-premises reporting moves to Power BI Report Server.
SQL Server Management Studio (SSMS) is the main management and development tool. It is a separate client tool that also manages Azure SQL Database.
Rewriting in plainer words…
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