For example Vodafone may be trading at £1.30 and 2 option traders might have opposing views. One believes the stock has the potential to rise significantly higher over the next few months, whereas the other thinks the price will slightly fall, but won't go below £1.10.
Both views are easily traded via options but of course each option trade will have its own associated risks and returns. For example, selling short options, can in the wrong hands, be an extremely risky trade.