C# (pronounced “C-sharp”) is a modern, versatile, and powerful programming language developed by Microsoft, suitable for various applications.C# is object-oriented, organized around objects and classes, enhancing code structure and maintainability.It is type-safe, secure, and runs on the .NET framework, making applications cross-platform compatible.Key concepts covered include type casting, operators, loops, conditionals, methods, and classes.User input/output in C# involves Console ReadLine for input and Console Write/WriteLine for output.Data types in C# include value types (int, float) and reference types (class, interface).Type casting allows conversion between different data types, providing both implicit and explicit casting options.C# operators are essential for calculations, comparisons, logical decisions, and more, with a rich set of built-in operators.Loops and conditionals in C# enable dynamic program flow control, allowing for decision-making and repetitive actions.Methods in C# are named blocks of code that perform specific tasks, accepting inputs and returning values.