When you enter text in the field at the top of the Safari window, Safari suggests matches from your bookmarks and browsing history.
Safari can also send the text you're looking for to a selected search engine for...
You can open multiple websites at once, either by opening a new Safari window (File > New Window) or by creating a new tab within the current Safari window (File > New Tab).
You can even switch views if you...
To open a site, select it from your bookmarks, or enter the website address in the field at the top of the window. Even if you don’t know the exact address, you can just type the words you are looking for, like "Apple"....
To open Safari, click the Safari icon in the Dock, or double-click its icon in the Applications folder. When you first open Safari, it shows bookmarks, Top Sites and the smart search field.