Option refers to the right to buy and sell in a certain period of time in the future. It is the buyer's right to buy or sell a certain number of specific subject matter to the seller at the performance price in a certain period or date in the future, but it has no obligation to buy or sell.

Options are divided into call options, put options and two-way options according to rights.

Futures: short for contract to buy or sell futures. Commodity exchange terminology

Stock: a document issued by a joint-stock company to each investor to prove the number and nature of its shares.

Fund: funds reserved for the establishment, maintenance or development of a cause.