Microsoft SQL Server is a Relational Database Management System (RDBMS) that can be used on a variety of platforms, including small single-processor computers and big multiprocessor servers. Numerous websites and business CRMs utilize SQL Server as their backend system since it supports thousands of concurrent users.
To assist you with your database administration and programming chores, SQL Server includes a number of tools. Compared to desktop database management systems like Microsoft Access, SQL Server is significantly more stable and scalable. The issues that were produced when too many users attempted to access the database will surely be recognizable to anyone who has ever tried using Access as a backend to a website!
SQL Server is most frequently used as a server database system, while it can also be used as a desktop database system.
You can try 3 types of SQL Server.
SQL Server on Azure:
Run SQL Server on Azure SQL with built-in security and manageability.
SQL Server at the edge:
Extend SQL to IoT devices for real-time analysis with Azure SQL Edge.
SQL Server on-premises:
Build intelligent, mission-critical applications with a scalable, hybrid data platform.
The above requires a license. You still can get the following free editions.
Developer Edition:
SQL Server 2019 Developer is a full-featured free edition, licensed for use as a development and test database in a non-production environment.
Express Edition:
SQL Server 2019 Express is a free edition of SQL Server, ideal for the development and production for desktop, web, and small server applications.
A step-by-step process of SQL Server installation has been defined in the Microsoft docs. Click here for the link.
Big Data and SQL 
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