A facet joint, also known as a zygapophysial joint, is a small but significant component of our skeletal system. These joints are found in the spine, connecting the vertebrae. They play a vital role in facilitating smooth, controlled movements of the spine. However, if facet joints become damaged or inflamed, it can lead to chronic pain and restricted mobility. While "facet joint" is the commonly used term, there are synonymous phrases that professionals and medical experts use interchangeably. These include z-joint, apophyseal joint, and posterior intervertebral joint. Familiarizing ourselves with these synonyms can help better comprehend discussions related to spinal health and conditions affecting facet joints.