A Continuous Stirred Tank Reactor (CSTR) is a type of chemical reactor where reactants are continuously fed into the tank while products are simultaneously removed. This design allows for a constant reaction environment, ensuring that the contents are well-mixed and maintain uniform composition throughout the process. CSTRs are commonly used in various industries, including pharmaceuticals and petrochemicals. In a CSTR, the reaction occurs at a steady state, meaning that the concentrations of reactants and products remain constant over time. The mixing is achieved through mechanical stirrers or pumps, which help maintain homogeneity. This reactor type is essential for processes that require continuous operation and efficient heat and mass transfer, making it a vital component in chemical engineering.