Rolling element bearings play vital role in the working of rotating hardware or machine. The imperfection-initiated vibration signal estimation and its examination is frequently utilized in deficiency recognition of direction. The crude sign is mind boggling in nature to dissect for deformity highlights, Therefore the sign be prepared to break down it. This article presents different sign handling procedures including canny strategies, for example, Artificial Techniques, Machine learning techniques and so on. The suitability of these strategies, all things considered, depends on the idea of features isolated from the bearing signs. The writing containing procedures utilized by different analysts have been managed in this review. This review may fill in as a kind of perspective for the scientists to go over different strategies in bearing diagnostics.