And while it isn't necessarily required that you enable it in order to use Safari, it's something that you'll probably want to do. Otherwise, many websites you visit will look strange, or even broken.
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1. Open Safari (it's the compass icon that, by default, lives in your bottom toolbar).
2. In the top toolbar, select "Safari."
3. In the dropdown menu, click "Preferences."
4. Toggle over to the "Security" tab.
Once you've done that, you can close out the "Preferences" window, and you're good to go.