Warning!
If you are in business and do not have a web presence (not just a website) you're losing money and are running the risk of losing your business! This means you MUST have a website, but not only that, your website must be mobile-friendly in order to show up in search engine results, or it is like a billboard in the desert - nobody will ever see it.
Studies show that mobile device searches for goods and services will surpass desktop and laptop computer searches in just a few short years, which means your website MUST be mobile-friendly.