Genus Paracheirodon belongs to the family of Characidae, a group of freshwater fish commonly found in South America. There are two species that are commonly known under this genus, the Neon tetra (Paracheirodon innesi) and the Cardinal tetra (Paracheirodon axelrodi). The words "Paracheirodon," "Neon tetra," and "Cardinal tetra" are all synonyms for this genus. In addition, the term "tetra" is often used to describe small, peaceful, and colorful fish that belong to this family. These synonyms are often used interchangeably and are commonly used among hobbyists and fish enthusiasts. The Genus Paracheirodon is valued for its vibrant colors, peaceful demeanor, and ease of care, making it a popular choice for aquariums.