Hydrogels have high affinity to absorb water due to the presence of hydrophilic group; Hydrogels can be prepared from both natural and synthetic polymer. Though the synthetic polymers are preferred more due to their less risk of immune response and less chances of viral and bacterial attack With increasing efforts devoted to controlled release of drug molecules, the application of hydrogels will continue to grow in future with its more relevantly and more efficiently applications, The success of hydrogels as delivery systems can be judged by several marketed preparations.