Vibration in bearings refers to the oscillatory motion resulting from mechanical irregularities or operational stresses. Common sources include surface defects like dents or rust, misalignment, imbalance, and improper lubrication. As rolling elements pass over a damaged raceway or a foreign particle, they generate repetitive shocks at predictable frequencies. These vibration signatures are crucial for condition monitoring. Sensors such as accelerometers capture the vibration data, which is then analyzed using techniques like Fast Fourier Transform (FFT) to identify specific fault frequencies. Early detection of abnormal vibration prevents catastrophic failure, reduces downtime, and enables predictive maintenance. Without proper damping or corrective action, excessive vibration accelerates wear, generates heat, and ultimately leads to bearing seizure. Therefore, monitoring vibration is essential for ensuring reliability, safety, and efficiency in rotating machinery across industries.