Emojipedia

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🙋 Emoticon, smiley, emoji, what’s the difference?

👉 Emoticons and smileys are often used to describe small face-like icons available in instant message services and messaging apps.

Apps that includes emoticons and smileys are not always compatible with each, as the options and meanings available may not be the same on each platform.

Emoji is a standardised set of characters that is available on iOS, Android, Windows and OS X. While the artwork for each emoji character varies by platform, the meaning of each symbol remains the same.[…]

Source: Emojipedia