Tridoshas are the three humors or forces of the body, which bring health when in balance, and produce diseases when out of balance.
The three doshas are called Vata, Pitta and Kapha.
The doshas ensure that all mahabhutas are held together and exert their functions in synergism for the optimum function of the human body. These are forces or energies that work through the body to maintain homeostasis.
Vata is the force that holds together Akasha and Vayu mahabhuta.
Pitta is the force that holds together Agni and Jala mahabhuta.
Kapha is the force that holds together Prithvi and Jala mahabhuta.