Emojis are a popular way of sending visual emoticons – for easy access, add the Emoji keyboard. Open the Settings app, select General, then Keyboard, followed by Keyboards. Select Add New Keyboard…, find the Emoji option and tap to add it.
When typing, tap the Emoji icon (a smiley face) and the Emoji icons will appear. When you’ve finished adding them, tap the Globe icon to return to your usual keyboard. Have fun! 😀