A friend of mine told me recently that he watched a video about a cool car tuning gadget that he wanted to buy. The video did not have any clear information on how to buy the product and he ended up never making a purchase. The key element that was missing in this video was a call-to-action. As a result, the company lost a client who was ready to spend $1,000.A good call-to-action helps to avoid such situations and prompts the desired behavior from your viewers.