"Razor is a markup syntax that uses HTML and C# for writing UI components of Blazor web apps. Razor is based on ASP.NET and designed for creating web apps." — Microsoft's website
"Blazor is a free and open-source web framework that enables developers to create web apps using C# and HTML. It is being developed by Microsoft." — Wikipedia
"What is C# ? It's a powerful and widely used programming language that you can use to make websites, games, mobile apps, desktop apps and more with .NET. Learn C#, get started, and it'll give you the world." — From Microsoft's website