In each reaction, a different product is formed. So when our reaction takes pathway one, we form one product. When our reaction takes place and follows pathway two, we form a different product. So if a reaction takes place on an unsymmetrical compound such as this alkane, unsymmetrical simply means if we cut this in half, the left is different from the right. So if a reaction takes place on an oxymetrical compound, different pathways are possible. And this is known as regiochemistry.