The document discusses active and passive components in electronics. It defines passive components as circuit elements that receive and store energy in electric or magnetic fields, but cannot continuously deliver power. Passive components mentioned include capacitors, inductors, and transformers. Active components are defined as having gain or ability to control voltage/current, and include transistors and integrated circuits. The document provides examples of capacitors, inductors, and transformers as passive elements, and contrasts them with transistors as active elements.