Spotlight search is one of my favorite things about my mac. Using the built-in Command-Space shortcut, you can pull up spotlight and perform a variety of commands. I frequently use spotlight as a calculator, and I locate and open files pretty exclusively using spotlight. It’s a search engine for your computer, but it also works as an internet search engine as well. You can type in a word and it will suggest a definition, or you can search for anything as you would in Google and it will give you results.