A trading or hedging approach that uses a combination of financial instruments, such as options, forwards, and spot positions, to replicate the payoff or risk profile of another strategy or instrument. Synthetic strategies are used to achieve similar economic exposure without directly entering into the original transaction. 

These structures are especially valuable in markets where certain instruments may be illiquid, costly, or unavailable due to regulatory, operational, or timing constraints. By constructing a synthetic equivalent, investors and risk managers can achieve the desired market outcome while gaining greater flexibility, control, or cost efficiency. 

For example, instead of purchasing a currency forward to lock in a future exchange rate, a firm might create a synthetic forward by simultaneously buying a call option and selling a put option with the same strike price and expiry. This combination mimics the payoff of a forward contract. 

Synthetic strategies are widely used in currency risk management, arbitrage, structured products, and trading. While they can be tailored to meet specific objectives, they also introduce complexity in terms of pricing, margin requirements, and risk monitoring. Effective implementation requires a solid understanding of derivatives, market behavior, and the interactions between component instruments.