 Hydrogels are a type of material with a high water content that can be used as a supportive matrix for cell immobilization and growth factor delivery. They have been used extensively in tissue engineering due to their ability to mimic the native extracellular matrix and provide mechanical support for cells. Smart hydrogels are a specialized class of hydrogels that contain embedded sensors and actuators that allow them to respond to external stimuli such as temperature, pH, light, and electricity. These properties make them particularly useful in tissue engineering applications where they can be used to monitor and control the environment around the implanted cells. This article was authored by some Sundarmantha, some Gepalai, Parisa Chayambashi, and others.