What are the three types of monitors?

The three types of monitors can be understood differently depending on context. In computer hardware, the three main types of display monitors by panel technology are LCD, LED, and OLED monitors. LCD monitors use liquid crystals, LED monitors are a type of LCD that uses LED backlighting and are the most common today, and OLED monitors use organic compounds that emit light individually for better contrast. By purpose, three types might be standard office monitors, gaming monitors with high refresh rates, and professional monitors for design and video editing with accurate color. In terms of people who monitor, three types could be supervisors who oversee work, inspectors who check compliance, and observers who watch and report without intervening. In monitoring functions, three types are often described as process monitors that check implementation, performance monitors that track results, and compliance monitors that ensure rules are followed. The phrase three types of monitors is therefore ambiguous without context, but most commonly when people ask, they are referring to display monitor technologies or to categories of monitoring roles in projects and workplaces.