Hey Surabhi,
There are mainly 2 types of primary fat found in body:
1. Saturated fats
Saturated fats are the only fatty acids that raise blood cholesterol levels. Saturated fats are found in meats and whole dairy products like milk, cheese, cream and ice cream. Some saturated fats are also found in plant foods like tropical oils (coconut or palm kernel oil).
2. Unsaturated Fats
Unsaturated fats are usually liquid at room temperature. They are found in most vegetable products and oils. An exception is a group of tropical oils like coconut or palm kernel oil which is highly saturated. Using foods containing "polyunsaturated" and "monounsaturated" fats does not increase our risk of heart disease. However, like all fats, unsaturated fats give us 9 calories for every gram. So eating too much of these types of fat may also make us gain weight.