In this chapter authors have discussed the role of plants to develop contaminant free environment. This concept is also known as Phytoremediation. Phytoremediation is a word formed from the Greek prefix "phyto" meaning plant and the Latin suffix "remedium" meaning to clean or restore. This technology has been receiving attention lately as an innovative, cost-effective alternative to the more established treatment methods used at hazardous waste sites. Phytoremediation can be classified into different applications, such as phytofiltration or rhizofiltration, phytostabilization, phytovolatilization, phytodegradation and phyto-extraction etc. The chapter will deal with phytoremediation, its advantages, limitations and in detail techniques of classification and application.