A dedicated server is not someone who is attentive to you in a restaurant. When you hear the term "dedicated servers" online it usually refers to the type of web hosting provider for a website.
If you have started an internet website, you are probably aware that you need a host. There are several different types of web hosting available. You can get hosting through a free server. This is usually used by people who want to have a personal web page for friends and family. A free server will most likely put their own ads on your web page so that they can generate income. There are also shared servers. A shared server is the logical choice of most businesses starting out on the website. Because internet hosting can cost hundreds of dollars per month, most small businesses choose a shared server so they do not have to invest so much money at the onset of their business.