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Carbohydrates provide us with energy.Unlike other nutrients carbohydrates release energy very quickly.We consume carbohydrates in two main forms:sugar and starch.
Whole grains, cereals,potatoes and sweet fruits like grapes and mangoes are natural sources of carbohydrate.
Carbohydrates give us instant energy when required.  For ex: it is present in bread, chapatti, Rice etc. There are two major types of carbohydrates in food: Simple and Complex.
Simple carbohydrates: These are also called simple sugars.
 Simple sugars are found in refined sugars, like the white sugar.
Complex Carbohydrates: They are also called starches. 
Starches include grain products, such as bread, crackers, pasta, and rice. As with simple sugars, some complex carbohydrate foods are better choices than others.