The date fruit (Phoenix dactylifera), which is essential to diet and economy in dry areas, has an exceptional nutritional and chemical makeup that supports its importance on a global scale. This chapter offers a thorough examination of the composition of dates, highlighting their practical and health-promoting qualities. Dates are a great natural energy source because they are mostly carbohydrates (71.2–81.4% dry weight), mostly fructose and glucose. Dates provide a varied profile of essential and non-proteinogenic amino acids, despite having a moderate protein concentration (1–7%). It has a low-fat content (0.1–2% meat) and is made up of healthy fatty acids. In addition to provitamin A (beta-carotene) and vitamin C, dates are a great source of B vitamins and important minerals (especially potassium, magnesium, and calcium). Importantly, dates contain strong bioactive substances that have anti-inflammatory, antioxidant, and other medicinal properties. These include carotenoids (like lutein and β-carotene), flavonoids (such as apigenin and rutin derivatives), and phenolic acids (like gallic and ferulic acids). Dietary fiber, which is mostly insoluble and ranges greatly (1.9–0.25%), promotes metabolic processes and gut health. The chapter also discusses how date by-products might be valued as commercial ingredients for nutraceuticals and functional foods, such as seed flour, oil, and syrup. Together, dates’ distinct chemical composition makes them a nutrient-dense, multipurpose food that is essential for promoting health and sustainable food systems.