The term “critical” can have different meanings depending on the context. In a surgical context, the term “critical” typically refers to a portion of a surgical procedure that is essential for the success of the surgery and requires the direct involvement of the primary surgeon. These critical portions may include the initial incision, the removal of tissue or organs, and the closing of incisions or wounds.

During these critical portions, the surgeon must be physically present and actively engaged in the procedure to ensure the safety and success of the surgery. Any error or mistake during these critical portions can potentially compromise the patient's health and recovery.

Outside of the surgical context, the term “critical” can also refer to something that is essential, indispensable, or extremely important. For example, critical thinking skills are important for problem-solving and decision-making in various fields, while critical infrastructure refers to the systems and structures that are essential for the functioning of a society, such as power grids, transportation systems, and communication networks.