In the parallel reactions, a single reactant may be converted into several different products simultaneously. There are numerous examples of such reactions in organic chemistry.
Series (Consecutive) First-Order Reactions
A similar situation of Consecutive reaction is nuclear chemistry where a nuclide decays to a daughter nuclide that is also radioactive and undergoes decay.
Compare between the kinetics of parallel first-order reactions and consecutive first-order reactions, referring to the schematic diagram of each type of reaction.