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Reflection in C# is a runtime feature that allows the program to dynamically inspect and interact with the metadata of assemblies and types like classes, interfaces, value types, methods, fields, and properties. Some uses of reflection in C# include:

• loading assemblies or types at runtime based on external input;
• automatic type mappings to copy data between properties with matching names or attributes;
• developing a dependency injection (DI) container to resolve constructors, inject parameters, and activate services;
• exporting data into CSV when hard-coded property mapping is impractical;
• testing tools using reflection to discover test methods and attributes without manually registering each test case.

Examples of reflection in C#:

• Basic method invocation. The code can be used to map domain models to a DTO or vice versa without writing separate mapping logic for each type.
• Dynamic plugin/assembly loading. This can be done using reflection to load an assembly at runtime, create an instance of a type by its name, and call a method on the new object.

Reflection provides access to type and assembly metadata and enables the invocation of their methods without hardcoding them. However, it brings performance overhead to the code, so it should be used properly.