What is the difference between source and reservoir?

The difference between Source and Reservoir is that source is a major thing from which we receive a product or necessities.It is a direct way of getting our daily needs.EXAMPLE:The fishes we get from rivers,the water we get from waterfalls,were reservoir is a area where we can store and use the products from sources.it is an indirect way of getting our needs.EXAMPLE:The fish we get from markets, the water we get from Dams..