Siderophore is low molecular weight secondary metabolites secreted by many bacteria, fungi and some grasses to chelate iron from the surrounding environment. The process is available to the cell in the form of siderophore and iron complex to help in plant metabolism. Ethylene Diamine Tetra Acetic Acid (EDTA) is widely used as a chelating agent by the farmer but there is a big advantage of using siderophore over synthetic chelator as it is not harmful to plant system nor it has any adverse effect on soil. Siderophore enhances the bioavailability of highly insoluble iron and prevents the production of harmful free radicals within the cell. Siderophores of both microbial and plant origin are well known for binding various metals other than iron. Therefore, utilization of siderophores for sequestering and eliminating toxic metals from the environment appears to be an effective technique. Siderophore and cadmium complex shows that cadmium has a more binding affinity than iron, and therefore it can be used for the sequestration and detoxification of cadmium ions from the environment. Siderophore production can be detected by SD-CASA method and can be determined by changing the colour of dye from blue to violet. The objectives of this work were to outline and discuss the important role of siderophore as plant growth promoter as well as a biocontrol agent.