Quick, some short examples of practical benefits:
1. You can describe in detail, in great detail, your products or services, and the potential buyer is very comfortable to find and read this information.
2. It can make you easier to find (for the reason I mentioned above: people search on Google, not the Yellow Pages. Those times are gone and they never come back).
3. You save time, giving up the explanations given orally about what you sell, what you do, where I can find you, etc.