Unlike high Reynolds number, for lower Re numbers the flow is initially laminar and is prone to separate even under mild adverse pressure gradient. Under certain flow conditions, the separated flow reattaches and forms a Laminar Separation Bubble (LSB) while transitioning from laminar to turbulent state. Laminar separation bubble could modify the effective shape of the airfoil and consequently influence the aerodynamic performance of flying vehicles like micro UAVs, High Altitude Long Endurance (HALE) Reconnaissance aircrafts, etc. generally in a negative manner. The main aim of this review work is to uncover the major research activities on different aspects of LSB which have been carried out theoretically and experimentally for past few decades till present time.