Fish sauce in Thailand is called nam pla (Thai: น้ำปลา). In Isan, it is called nam pa. Similar to the Laotian padaek is pla ra (Thai: ปลาร้า), also used in Thai cuisine. In Thailand, fish sauce is used both in cooking and also served at the table as a condiment, for instance in noodle soups.
We love the flavor of fish sauce for its umami, the earthy, savory flavor field that makes things like mushrooms, roasted tomatoes, and soy sauce taste so complex and crave-able. There's a distinct, pungent fishiness to the sauce, sure, but that flavor is flanked by a salty, briny, caramel-y sweetness