C# has introduced numerous new data types, type constructs, and language features since C# 7.0, aimed at enhancing performance, type safety, and developer productivity. This article provides a thorough summary of the type system additions in C# 7.0 to C# 14.0 (as of April 2023, C# 14.0 is a preview version). Key features include value tuples, Span, ReadOnlySpan, Memory, and more. These enhancements have significantly improved the language's ability to handle complex data and provide a more expressive and efficient programming experience.