C# 12 introduces type aliasing in .NET 8, allowing developers to create shorthand names for complex or frequently used types.Before C# 12, using directives could only create aliases at the namespace level, but not as true type synonyms.The new type keyword in C# 12 makes type aliasing more intuitive and flexible.Type aliasing in C# 12 improves code readability and maintainability, especially for long, complex, or generic types.