Critical illness refers to a severe health condition that poses a significant risk to a person's life or long-term health. Examples of critical illnesses include heart attack, stroke, cancer, and organ failure. These conditions often require immediate medical attention and can lead to long-term complications or disability. Many people choose to purchase critical illness insurance to help cover the costs associated with treatment and recovery. This type of insurance provides a lump-sum payment upon diagnosis of a covered illness, helping individuals manage medical expenses and maintain financial stability during a challenging time.