Components are the fundamental building blocks of Blazor applications, encapsulating reusable UI elements and their associated behavior.

Usually, Blazor components are defined in Razor syntax, which mixes HTML content with C# code inside the same file.

Developers can create components by defining a new .razor file or a C# class that inherits from the ComponentBase class.

 

Much like using HTML tags, developers may just add a child component into the markup of another parent component or page to use it inside a Blazor application

Components can also accept parameters, allowing data to be passed down from parent to child,  and child can generate events to relay state changes back to their parents.