Indoor plants are not only the decorative elements of the houses and offices, but they are also the natural air purifiers that improve indoor air quality and are beneficial to human health. People nowadays, because of their modern lifestyle, are trapped for long hours in indoor spaces which in turn are full of pollutants such as dust, smoke, volatile organic compounds (VOCs), and allergens. Some indoor plants like aloe vera, snake plant, and peace lily are capable of absorbing harmful substances, releasing oxygen, and even keeping the humidity at a certain level, thus, they make the living environment healthier. Moreover, these plants do not only bring physical advantages, but also positively impact mental health by lessening the stress and increasing the concentration. This article describes indoor plants, how they clean the air, and the scientific evidence that backs up their benefits.