Electromagnetic fields (EMFs) are areas of energy that surround electronic devices. EMFs are classified into two categories: low-frequency EMFs and high-frequency EMFs. Low-frequency EMFs are emitted by power lines, electrical wiring, and household appliances, while high-frequency EMFs include ionizing radiation such as X-rays and gamma rays, which are known to have enough energy to remove tightly bound electrons from atoms, thus potentially causing cellular damage.