In today's financial markets, the distinction between stocks and shares has been somewhat blurred. Generally, these words are used interchangeably to refer to the pieces of paper that denote ownership in a particular company, called stock certificates. However, the difference between the two words comes from the context in which they are used. For example, "stock" is a general term used to describe the ownership certificates of any company, in general, and "shares" refers to a the ownership certificates of a particular company. So, if investors say they own stocks, they are generally referring to their overall ownership in one or more companies. Technically, if someone says that they own shares - the question then becomes - shares in what company? Bottom line, stocks and shares are the same thing.

stock is stuff you have in your stockpile, while share is the stuff that you should get. here's an example of "stock" in a sentence: Employee saying this to his boss at work: "Mr. Johnson, we only have two items in stock, we need to order more." Here's an example of how to use "share" in a sentence when it's used as a noun: "three slices of pizza for me, three slices for you, three slices for Mary and three slices for John; now we should all have our share of pizza." Hope this helped :)

Stock=股票，Shares=股份