First aid is the immediate care given to someone who is injured or suddenly ill before professional medical help arrives. It helps stabilize the person’s condition, prevent the situation from worsening, and can save lives.

Fire extinguishers come in various types, including water, foam, dry chemical, carbon dioxide (CO₂), and wet chemical, each designed for specific fire classes. Using the right type ensures effective firefighting and prevents the fire from worsening.

Fires are classified into different classes based on the type of fuel involved, such as Class A (ordinary combustibles), Class B (flammable liquids), Class C (electrical fires), Class D (flammable metals), and Class K (cooking oils and fats). Knowing the class of fire is essential for selecting the correct extinguishing method and equipment.