Abstract: The current rate at which population is increasing and the land which is used for agriculture shows a disbalanced relationship forcing the scientists to think of either alternative or a way to increase food production per unit of land available. Apart from the stated fact, the current agriculture practices for instance, excessive use of chemical fertilizers, contributes to land detieoration and produces a land with high acidity, low organic matter attributing to low production of crop with high percentage of health threats. This concerning situation has led to adopt the use of Plant Growth promoting Rhizobacteria “PGRPs”, which are tiny microbes with a large contribution in global processes. The present review highlights the mechanism behind PGPR activities by classifying them as direct and indirect way.