This lecture introduces the basics of writing a simple C++ program. It emphasizes the importance of functions, explaining that every C++ program must have at least one function, with one specifically named 'main'. The 'main' function is where the program execution begins. The concept of functions is further explained as blocks of code designed to perform specific operations. While a detailed explanation of functions is reserved for later lectures, this introduction lays the foundation for understanding the structure of C++ programs.