Adjustments, or manipulation as they're sometimes referred to is the minor movement of vertebrae in the spine. The objective of this movement is to manipulate/mobilize vertebra joints that have become misaligned or restricted in motion for a number of reasons ranging from normal daily activity to trauma such as a car accident.
When these vertebral joints malfunction, it has an overall systemic effect from muscular to the central nervous system. Without proper movement and function and flow of all nerves and systems in the body from the brain, we can't function at our peak.
An adjustment is often a pressure from the chiropractor utilizing the hands or an instrument to move a vertebrae back into place. This happens with a quick movement and is often without discomfort. You may hear a noise that sounds like you're cracking your knuckles referred to as joint cavitation. It is the release of gases such as oxygen and nitrogen from the joint.
Overall, adjustments are an excellent way to keep the body functioning at its highest level. When the body is in alignment, the body is able to respond and perform as it was designed to.