The term "essential drugs" refers to a select group of medications that are considered necessary for basic health care. These drugs are intended to be safe, effective, and affordable, making them accessible to everyone who needs them, regardless of their ability to pay. Essential drugs are usually chosen based on their therapeutic impact, ease of use, and wide availability. They are often used in the treatment of common diseases such as malaria, tuberculosis, and diarrhea, which disproportionately affect low-income populations. The concept of essential drugs was first introduced by the World Health Organization (WHO) in 1977 to help improve global health outcomes by ensuring that everyone has access to basic medical care.