Hydrogels are cross-linked polymers with the capacity to swell in a fluid medium. Crosslinking in hydrogels happens by synthetic or physical means relying upon the polymer properties and exploratory conditions. Attributable to a vast assortment in concoction structure and crosslinking strategies, different hydrogels have been set up for different applications in pharmaceutical and biomedical fields. This part starts with brief presentation, preferences, detriments, order, sorts of hydrogel are talked about likewise. They are insoluble because of the nearness of compound (tie-focuses, intersections) and/or physical crosslinks, for example, ensnarement’s and crystallites. These materials can be blended to react to various physiological boosts present in the body, for example, pH, ionic quality and temperature. At last, the part finishes up with known hydrogel applications in the pharmaceutical area.1