An option strategy is implemented by combining one or more option positions and possibly an underlying stock position. Options are financial instruments that give the buyer the right to buy (for a call option) or sell (for a put option) the underlying security at some specific point of time in the future (European Option) or until some specific point of time in the future (American Option) for a price (strike price), which is fixed in advance (when the option is bought).
Calls increase in value as the underlying stock increases in value. Likewise puts increase in value as the underlying stock decreases in value. Buying both a call and a put means that if the underlying stock moves up the call increases in value and likewise if the underlying stock moves down the put increases in value. The combined position can increase in value if the stock moves significantly in either direction. (The position loses money if the stock stays at the same price or within a range of the price when the position was established.) This strategy is called a straddle. It is one of many options strategies that investors can employ.
Options strategies can favor movements in the underlying stock that are bullish, bearish or neutral. In the case of neutral strategies, they can be further classified into those that are bullish on volatility and those that are bearish on volatility. The option positions used can be long and/or short positions in calls and/or puts at various strikes. (Wikipedia)