Bioremediation refers to the use of microorganism to degrade the contaiminants that pose environmental and human risks to the population of a region. Bioremediation involves the actions of many different microrganisms acting simultaneously or in sequence to complete the degradation process. Bioremediation is typically used to clean up oil spills, contaiminated groundwater or pollution of soil and land. Bioremediation can be in-situ (at the site of contaimination)or ex situ (location away from the site of contaimination). Bioremediation relies mainly on natural processes and minimises damage to ecosystems. Some of the bacterias used for bioremediation are - Pseudomonas, Dechloromonas, Deinocossus Radiodurans etc.