A more thorough explanation:

Definition: Professionalism is the practice of doing a job in a methodical, courteous, and ethical manner.

For example, a doctor who treats their patients with respect and follows ethical guidelines is demonstrating professionalism. Similarly, a lawyer who presents evidence in a clear and honest way is also being professional.

Professionalism is important because it helps to build trust between professionals and their clients or patients. When people know that they can rely on a professional to do their job well and with integrity, they are more likely to seek out their services in the future.