CTS (Common Type System): The Common Type System defines the data types which managed programs can utilize (CTS). CTS specifies how these types are defined, used, and handled during runtime. It facilitates cross-language integration, safety, and high-performance code execution. The CTS rules may be used to construct lasses and values. Alternatively, we can understand something like this: CTS handles data types. As a result, we have a variety of languages, each with its own data type. While the data type of one language may be unintelligible to another, the.NET Framework language can grasp any data types.  C# and VB.NET both provide integer data types. As a consequence, following compilation, a variable given as an int in C# and Integer in VB.NET uses the same structure Int32 from CTS as illustrated in the image below. CTS's structures and classes are shared with all languages and serve to promote language independence. As a result, it is referred to as CTS.  CLS (Common Language Specification): CLS (Common Language Specification) is a subset of CTS. It defines a set of rules and limitations that every language which runs on the.NET framework must adhere to. CLS Compliant languages include those that adhere to this set of guidelines. CLS supports cross-language integration, often known as interoperability. For example, if we are discussing C# versus VB.NET, every sentence in C# must conclude with a semicolon. Although it is commonly referred to as statement Terminator, each statement in VB.NET must not end with a semicolon (;).  While the syntax rules differ from language to language, CLR can comprehend them all because, in.NET, each language is turned into MSIL (Microsoft Intermediate Language) program after compiling, and MSIL code constitutes CLR's language specification.