The hexadecimal system is a mathematical system that uses 16 as its base. It is widely used in computer science and digital electronics. Some synonyms for this system include base-16, hex, and 16-ary. Another term that can be used interchangeably with hexadecimal is the term "hex code," which is a six-digit code that is used to represent colors in web design. The hexadecimal system has become an essential tool for the digital world, allowing data to be stored and processed more efficiently. It is a critical component of modern technology, and its use is likely to continue to grow in the future.