Secretary has two main meanings:

1. A person whose job is to handle correspondence, keep records, schedule appointments, and manage office tasks for a boss or organization. A secretary might type letters, answer phones, file important documents, and make sure meetings run smoothly. Before computers, secretaries were essential in nearly every office. Today, many of these duties are called “administrative assistant” work, but the role remains important: keeping everything organized so others can focus on their main work.
2. A high-ranking government official who leads a major department. In the United States, the president appoints secretaries to run departments like the Department of State, Department of Defense, or Department of Education. The Secretary of State, for instance, handles the United States' relationships with other countries. These secretaries advise the president and manage thousands of employees. Despite the title, they don't schedule appointments or type letters. They make major policy decisions.

Whether organizing an office or running a government department, secretaries share one thing: they manage important information and help complex organizations function smoothly.