The term "essential medicines" refers to a select group of drugs that are considered necessary for basic healthcare, often because they are effective in treating common diseases or conditions. These medications are usually affordable and available to all people, regardless of their ability to pay, and are typically included in national health systems' lists of covered treatments. The concept of essential medicines is based on the idea that everyone should have access to basic medical care, including necessary prescription drugs, as part of a universal right to healthcare.