Make it meaningful: If your domain name is a sequence of random letters and numbers, you can’t expect customers to remember it. However, if your domain name is easily associated with your business, it’ll be the first thing that comes to mind when customers want your service.
Keep it short: A long address is harder for customers to remember and to type into their web browser. Imagine having to remember and type www.new-york-fifth-avenue-deli-and-bakery.com every time you want sandwiches delivered for a lunch meeting. Wouldn’t you rather type www.deli5.com?
Keep it simple: Some companies use their initials for their domain name, such as www.bn.com for Barnes & Noble. It doesn’t lend itself to every name though—the fictitious New York Fifth Avenue Deli and Bakery might not be recognizable as www.nyfadab.com.