What is indispensible?

Indispensable means absolutely necessary or essential. It is something that cannot be overlooked or replaced and is crucial for the functioning of a particular system or process. For example, in a corporate organization, the human resources department is indispensable for managing the workforce, hiring new employees, providing training, etc. Similarly, in the medical field, doctors and nurses are indispensable for treating patients and saving lives. A person with indispensable skills or knowledge is highly valued and sought after, as their absence could result in significant setbacks or even failure of a project or endeavor.