Blazor is a web framework developed by Microsoft that allows developers to build interactive web applications using C# instead of JavaScript. It enables the creation of rich user interfaces with reusable components, making it easier to manage and maintain code. Blazor applications can run in the browser via WebAssembly or on the server, providing flexibility in how they are deployed. With Blazor, developers can leverage their existing knowledge of C# and the ASP.NET ecosystem, streamlining the development process. It supports modern web standards and integrates well with other Microsoft technologies, making it a popular choice for building dynamic web applications.