Raita is an Indian yoghurt condiment whereas Tzatziki is a Greek yoghurt dip. Although both raita and tzatziki are very similar in the fact that they are both made with thick, salted yoghurt; tzatziki is always made with grated cucumber while raita may have cucumber but also other grated/chopped veggies or fruit like carrot, onion, tomato and pineapple. Both have herbs - tzatziki has dill, mint and often parsley whereas raita has coriander and mint. Tzatziki is punctuated by the use of garlic and lemon while raita often has some spice element like chilli, toasted cumin or ginger.