What is .NET Core, and how does it differ from the .NET Framework?

What is .NET Core?

.NET Core is an open-source, cross-platform framework developed by Microsoft for building modern applications. It is part of the broader .NET ecosystem, designed to enable developers to create applications that can run on Windows, macOS, and Linux. .NET Core supports various application types, including web, cloud, mobile, desktop, and microservices.

Key Features of .NET Core:

1. Cross-Platform: .NET Core applications can run on multiple operating systems, which makes it versatile for different environments.
2. Open Source: The framework is developed as an open-source project on GitHub, encouraging community contributions and transparency.
3. High Performance: .NET Core is optimized for performance, making it suitable for high-demand applications.
4. Modular Architecture: Developers can include only the necessary libraries (NuGet packages) for their applications, reducing the footprint and improving performance.
5. Flexible Deployment: .NET Core allows for various deployment models, including framework-dependent and self-contained deployments.

How Does .NET Core Differ from the .NET Framework?

While both .NET Core and the .NET Framework share some similarities, they differ in several key areas:

Feature	.NET Core	.NET Framework
Platform Support	Cross-platform (Windows, macOS, Linux)	Windows-only
Open Source	Yes	No (Proprietary)
Deployment	Flexible (framework-dependent and self-contained)	Primarily framework-dependent
App Models Supported	Web, Cloud, IoT, Microservices, Desktop	Web, Desktop, Console, Windows Services
Performance	Optimized for performance	Generally slower than .NET Core
API Surface	Smaller and modular	Larger, monolithic
Entity Framework Support	EF Core (cross-platform)	Entity Framework (Windows-only)
Future Development	Actively developed and supported	Maintenance mode, with focus on .NET 5+ and beyond

Summary

In summary, .NET Core is designed to be a flexible, high-performance, and cross-platform framework suitable for modern application development. In contrast, the .NET Framework is a more traditional, Windows-only framework that has been in use for a longer period. Microsoft has consolidated both frameworks into a single platform with .NET 5 and later, combining features and capabilities from both to create a unified development experience.