One word domains are the best domains you can buy. They can be easier to remember than 3 letter domains and have higher SEO value. It has been said that Google considers keywords in the domain name as the single most important ranking signal aside from backlinks. Relevant one word domains are very limited and in high demand. Having a high quality domain name is also one of the greatest ways to build trust with customers. Domains are virtual real estate. And like real estate, they have been known to go up in value.