All that you wanted to know & more

Offer-price
The price to buy one share of a specific kind.

Open-end fund
A fund that does not have a fixed number of shares (as does a closed end fund or stock). The mutual fund will offer as many shares, as investors are willing to buy. These funds need to be bought through a broker. Most funds are open-ended unless otherwise noted.

Option
A financial instrument that gives the investor the right to buy or sell a given number of shares of the underlying stock at a fixed price within a specified time period.

Ordinary shares
A share that gives the holder part ownership of a company and entitle thee holder to share in the company profits in the form of dividends.