FluentValidation is a strongly-typed data validation library for .NET. It functions as a rule engine and input validation framework used to define and execute complex business rules and constraints for data objects.
The library utilizes a fluent interface API, allowing the construction of readable and declarative validation constraints through method chaining. It leverages generics and lambda expressions to enforce data integrity and business logic at compile time.
The project covers the enforcement of business rules, strongly-typed data validation, and input sanitization workflows to verify that object properties meet specific schemas before processing.