Emoji have become a fundamental component of text-based conversations, but their technical functionality is often overlooked until developers start working with them. The author of the article discovered that Emoji are represented by Unicode code points and can be combined using Zero-Width-Joiner (ZWJ) sequences to create more complex symbols like family and musical notes. These sequences allow for a wide range of variations, such as different skin tones and hairstyles, which were previously not possible with single code points. The article also explains how JavaScript handles Emoji, including the use of surrogate pairs to represent characters outside the Basic Multilingual Plane (BMP). Understanding Unicode and its role in representing Emoji is essential for developers who want to work with these symbols in their applications.