SInce they don't always mean the same thing in Europe, Asia, or Latin America, emoticons should be used with caution depending on the person to whom they are being sent. Here's a non-exhaustive list of some common emojis which can lead to cultural misunderstandings.
Now omnipresent in computer and smartphone messaging, emojis help express emotions and sometimes reinforce the adage that "an image is worth a thousand words". These digital "smileys", hands, and other pictograms originated in Japan and are now used throughout the world. There are now thousands listed at https://emojipedia.org/, with hundreds being added every year. They're so well-loved that they now have their own worldwide holiday on July 17.