What is an example of a professional dues expense?

Could you please elaborate on what constitutes a professional dues expense? Is it a fee that professionals in a particular field must pay to maintain their membership or certification? For instance, would the annual fee that an accountant pays to maintain their CPA license be considered a professional dues expense? Or perhaps the subscription fee that a lawyer pays to access legal research databases? Could you provide a clear example of a professional dues expense and explain its significance in the context of financial accounting?