The electromagnetic spectrum is made up of all the different types of electromagnetic waves, which are disturbances that travel through space at the speed of light. These waves can behave both like particles (photons) and like waves, depending on how they are observed. The different types of waves are categorized by their wavelength and frequency, which are related to their energy. Radio waves have the longest wavelength and lowest frequency, while gamma rays have the shortest wavelength and highest frequency. The electromagnetic spectrum is incredibly important in our daily lives, from the radio signals that allow us to communicate wirelessly to the visible light that enables us to see. It is also used in a variety of scientific and medical applications, such as MRI machines that use strong magnetic fields and radio waves to create images of the human body, and the use of infrared radiation to detect heat. However, different types of electromagnetic radiation can also be harmful, such as the ultraviolet radiation that causes sunburn or the ionizing radiation from x-rays and gamma rays that can damage our DNA and potentially cause cancer.