The document discusses the design and operation of various digital logic gates using complementary metal-oxide-semiconductor (CMOS) technology. It first describes the basic structure of a CMOS inverter using an n-MOSFET and p-MOSFET. It then shows how CMOS circuits can be used to implement common logic gates like NAND, NOR, OR, and AND by controlling the operation of the n-MOSFETs and p-MOSFETs based on the input signals. Truth tables are provided for each of the logic gates to illustrate their input-output behavior.