What is ASP.NET Core used for?

ASP.NET Core is used to build web applications, REST and gRPC APIs, and real-time services that need to run on Windows, Linux, or macOS.

Is ASP.NET Core free and open source?

Yes, ASP.NET Core is free, open source, and developed with community contributions on GitHub.

Blazor is a UI framework within ASP.NET Core that lets developers build interactive web front ends using C# instead of JavaScript.

Can ASP.NET Core run on Linux?

Yes, ASP.NET Core is fully cross-platform and runs on Linux and macOS in addition to Windows.

How is ASP.NET Core deployed in production?

It's commonly containerized with Docker and deployed to Kubernetes or a cloud platform like Azure App Service, often with Kestrel running behind a reverse proxy such as Nginx.

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ASP.NET Core

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NET — for building high-performance web apps, APIs, and real-time services that run on Windows, Linux, and macOS.

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Definition

ASP.NET Core is Microsoft's open-source, cross-platform web framework — a ground-up reimagining of ASP.NET — for building high-performance web apps, APIs, and real-time services that run on Windows, Linux, and macOS.

Overview

Released in 2016, ASP.NET Core runs on the modern, cross-platform .NET runtime rather than the Windows-only .NET Framework. It is built around a lightweight, modular request pipeline and the high-performance Kestrel web server, which is commonly deployed behind reverse proxies like Nginx in production. The framework supports MVC, Razor Pages, minimal APIs, and Blazor for building interactive web UIs in C# instead of JavaScript, backed by Entity Framework Core for data access. It is frequently containerized with Docker and deployed to Kubernetes or Azure App Service. ASP.NET Core is the direct successor to the original ASP.NET, unifying web, API, and real-time development (via SignalR) in a single cross-platform framework.

Key Features

Cross-platform runtime supporting Windows, Linux, and macOS
High-performance Kestrel web server built for cloud-native deployment
Minimal APIs for building lightweight HTTP services with little boilerplate
Built-in dependency injection throughout the framework
Blazor for building interactive web UIs in C# instead of JavaScript
First-class support for containers, Kubernetes, and cloud hosting

Use Cases

Building REST and gRPC APIs for cloud-native applications

Enterprise web applications requiring high throughput and low latency

Real-time apps like chat or dashboards using SignalR

Microservices deployed via Docker and Kubernetes

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