⇒ SQL server has two things: 1- SQL server versions :every year Microsoft add tools or updates. 2- SQL server Editions: some advantages but it is used by paying money (Enterprise(large scale..etc.), Standard developer, BI editions, Express, Azure (for cloud)).

When setting up SQL Server, you create an instance that includes two main components: services and applications.

1. Services:

These are background services that run SQL Server's core functions and features, depending on your use case (general database management, business intelligence, etc.).

2. Applications:

These are client applications or tools that help users interact with SQL Server services. They provide an interface to manage databases, design BI solutions, monitor performance, and more.

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⇒ Here are two types of instances you can install:

1. Default Instance: