Baking soda, which is also known as bicarbonate soda is a chemical compound made in the form of white crystals. It helps give a lift to baked goods and makes for a great cleaning product around the home.
Although it needs acidic ingredients for food to rise and is most commonly used within pancakes and muffins.
Baking powder on the other hand is an expanded version of baking soda combined with monocalcium phosphate and either sodium acid pyrophosphate or sodium aluminium sulfate. It already contains an acidic ingredient in which baking soda is missing.
The acids within the baking powder react when mixed with a wet mixture followed by a second reaction when exposed to heat.
It is more efficient to use for baked goods and can be used with baking soda.