Web browser software included with iOS and Mac OS X devices. It's the software that converts the code written by a website's designers into browsable text, pictures and dynamic content.
Other web browsers are available for both iOS and Mac OS X, such as Chrome, Firefox and Opera, although Safari will always remain the default browser on an unjailbroken iPhone or iPad; this means any time you click a link on Twitter or Mail iOS will open the link in Safari, even if you normally browse the web in Dolphin.
What's a screenshot?
A contraction of screen and snapshot, this simply means a static image of whatever is on a screen at a given time. It's useful for showing error messages and glitches to tech-savvy friends, for showing off photogenic moments in games, and (if you run a website for Mac, iPhone and iPad users) for illustrating tech tutorials, apps and games.
You can take a screenshot on a Mac by pressing Shift, Cmd and 4 and dragging the cross over the area you want to capture, but there are a few other techniques - capturing individual windows, the entire screen and so on - explained in that linked article.
To capture a screenshot on an iPhone or iPad, you simply need to press the Power/sleep/wake button (the one at the top) and the Home button (the one below the screen) at the same time.
Last of all, you can take a screenshot on Apple Watch by pressing the Digital Crown (the dial) and the side button at the same time.
What is the Settings app?
A pre-installed app in iOS that enables you to adjust system-wide settings - such as changing the desktop wallpaper, switching Wi-Fi or data roaming on or off, or turning down the screen brightness - or specific settings for individual apps. A few of the most frequently used settings, such as the brightness, volume, Airplane Mode and Do Not Disturb, can also be accessed via the Control Centre.
The Settings app icon is the one that looks like a load of grey cogs. (Mac OS X uses a similar icon for System Preferences.)
What is the Sleep/Wake button?
The button at top of iOS devices that enables you to wake up the device, or put it back to sleep. If you hold it down you can power the device down completely. Sometimes also called the power button.
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