• The CLR also includes a Common Type System (CTS).
• The Common Language Specification (CLS) defines the aspects of the CTS that is supported by all .NET languages.
• CLS says that each language must provide:
  • value types
    • primitive types,
    • struct types,
    • enumerations
  • reference types
    • class types,
    • interface types,
    • array types,
    • delegate types