The document discusses fracturing and frac reports. It notes that the term "stage" is used to refer to both "fluid stages" and "perf zone stages" in frac reports. The slides show examples of how fluid stages are subsets of larger perf zone stages when describing the pump schedule and volumes used in hydraulic fracturing of a well. Frac reports contain important data like pump schedules and volumes that describe the stages and fluids used to fracture different zones of a well.