So but whats would be the introduction for the essay?

Here's a possible introduction for your essay, focusing on the core themes of ethics in public administration:

The practice of public administration and management is fundamentally intertwined with ethical considerations. As institutions tasked with serving the public interest, government bodies and their employees operate under a unique set of moral and professional obligations. This essay will explore key perspectives on ethics in public administration, examining the relationship between personal morality and professional ethics, the role of professionalism and ethical codes, and the evolution of public sector ethics from the twentieth to the twenty-first century. Understanding these dimensions is crucial for ensuring accountability, fostering public trust, and promoting effective and just governance.