Why do all websites look the same now?
Websites often look the same because the designers and developers know that Google is going to crawl (review the content on your website) in a specific way. As they crawl, they will search for links, make sure things are structured correctly, and identify where the important information is stored.
How do you describe the UI of a website?
The user interface (UI) is the point of human-computer interaction and communication in a device. This can include display screens, keyboards, a mouse and the appearance of a desktop. It is also the way through which a user interacts with an application or a website.