You could think of the sites that share your server as your roommates; there's really not that much separating you from them. Sure, you can close the bedroom door, but they can still cause nightmares for you in the kitchen and the bathroom. In web hosting terms, all the sites share a single server's resources, so huge traffic spike on Site A may impact the neighboring sites' performances. It's even possible that another site could take down the shared server altogether, if it crashed hard enough.
Note: In fact, creating a website or blog on WordPress CMS is similar to planning a trip alone. You’re planning a route, booking a hotel, and buying airline tickets and guided tours all by yourself. You also arrange getting a visa, if necessary. Conversely, using online website builders is like asking a travel agency to take care of everything: they offer you an “out-of-the-box” product. Though this comparison is too rough, I hope you’ve understood the difference.
Almost all the services offer some sort of drag-and-drop website builder that makes it easy to drag and drop items to build your page. These are great for getting started, but they often lock you into the service. Most website builder setups are proprietary to the service, or don't create HTML that's portable enough to be easily moved to another service if you decide it's necessary.
I’ll go into each of the above different hosting options shortly, just to give you an overview. But if you want to pitch the different ways of hosting or hosting providers against each other, I’ve got you covered with the comparison section and explanations of the types of web hosting so you can get an idea of what the best service type is for your situation. TOP 5: Best Web Hosting Service 2019