In recent years, the main challenge that scientists have faced has been to gain a good understanding of the new properties of materials at the nanometric level in order to subsequently know how to control them. Currently this multidisciplinary science is already applied to different sectors. The creation of new materials with extraordinary properties opens up a wide range of possibilities in the industry, to create new products or improve existing ones. In addition, it promises solutions to multiple problems that humanity currently faces, such as environmental, energy or health problems. Thanks to nanotechnology, new lighter, stronger and cheaper materials are being obtained. Practical applications for everyday use are already available on the market: in cosmetics, computers, household appliances and telephony. Although possibly the most interesting results are found in the field of medicine and the pharmaceutical industry. An invisible world to the human eye that will increasingly offer us more benefits.