If you buy a put, you are essentially betting that the price will drop. If you decide to exercise the option on a $10 strike for a stock trading at $8, the counter party has to buy that stock from you at $10 and if you didn't actually hold the underlying stock you'd be left with an open short position. But it may not be worth it if you paid $3 in premium for the put.
Flip that around and say you wouldn't mind owning SVM at $10 but it is currently trading at $9. you could sell an in the money put and pocket the premium (which would most likely be more than $1 due to intrinsic value plus time value). If you were assigned the option, your actual cost to buy the stock would most likely be less than the stock is trading for after you take into account the premium you pocketed for selling the put. Let me know if that's not clear - explaining options can get a bit wordy.