Your brand strategy is how, what, where, when and to whom you plan on communicating and delivering on your brand messages. Where you advertise is part of your brand strategy. Your distribution channels are also part of your brand strategy. And what you communicate visually and verbally are part of your brand strategy, too.
Consistent, strategic branding leads to a strong brand equity, which means the added value brought to your company's products or services that allows you to charge more for your brand than what identical, unbranded products command. The most obvious example of this is Coke vs. a generic soda. Because Coca-Cola has built a powerful brand equity, it can charge more for its product--and customers will pay that higher price.
The added value intrinsic to brand equity frequently comes in the form of perceived quality or emotional attachment. For example, Nike associates its products with star athletes, hoping customers will transfer their emotional attachment from the athlete to the product. For Nike, it's not just the shoe's features that sell the shoe.