Here's a pointwise explanation of the statement:

🐍 Python: Optional Type Hints (Not Enforced at Runtime)

1. Type hints are optional:

   • Python allows you to annotate variables and function signatures with types.
   • These are not required and are ignored at runtime.

2. Purpose:

   • Type hints are mainly for code clarity, IDE support, and static analysis (e.g., with mypy, pyright).

3. No enforcement:

   • Python does not enforce type hints during execution.
   • You can pass a string to a function expecting an int, and it will not raise an error unless the code breaks.

4. Example:

   def add(a: int, b: int) -> int:
       return a + b
    
   print(add(5, 3))       # ✅ Works
   print(add("5", "3"))   # ✅ Works, returns '53' (string concatenation)

💻 C#: Strict Typing Enforced at Compile Time

1. Strongly typed language:

   • C# requires explicit type declarations.
   • The compiler checks types at compile time.

2. No optional hints:

   • You must declare types for variables and function parameters.
   • Type mismatches result in compile-time errors.

3. Purpose:

   • Ensures type safety, performance, and early error detection.

4. Example:

   int Add(int a, int b)
   {
       return a + b;
   }
    
   Console.WriteLine(Add(5, 3));     // ✅ Works
   Console.WriteLine(Add("5", "3")); // ❌ Compile-time error

🆚 Difference Table: Python vs. C# Typing