This document discusses two types of flip flops: the set-reset flip flop and the D-type flip flop. The set-reset flip flop has set (S) and reset (R) inputs that determine the state of its outputs (Q and Q'), while the D-type flip flop uses a clock (CLK) and data (D) input to determine its state. The document examines the behavior of each flip flop under different input conditions and provides a brief overview of the internal components of a D-type flip flop.