Recent developments in polymer science have provided good opportunities for developing composites reinforced by natural fibers. The superior sustainable and economical merits behind these composites make them much sought after in commercial and industrial applications. Besides being biodegradable and recyclable, they can be produced from renewable resources, thus providing good alternatives to synthetic fiber-reinforced materials. Along with their satisfactory mechanical properties, the adequate availability of abundant resources like flax, jute, and hemp only makes them appealing. This paper focuses on the classification, applications, and key mechanical and chemical properties of reinforced composites, highlighting their significant benefits in terms of ecological sustainability and material performance.