This document discusses sterilization and disinfection of surgical instruments. It defines sterilization as the complete removal of microbes including bacteria and viruses. Disinfection is less stringent and does not remove all microbes. Disinfection is categorized into high, intermediate, and low levels based on the types of microbes eliminated. The document also discusses mechanical washing, ultrasonic cleaning, and lubrication of surgical instruments as important processes to remove soil and microbes and ensure proper functioning.