Electromagnetic units are measurements used to quantify electric and magnetic phenomena. The International System of Units (SI) defines several key units, such as the volt for electric potential, the ampere for electric current, and the tesla for magnetic flux density. These units help scientists and engineers describe how electric and magnetic fields interact and influence each other. In addition to SI units, there are also alternative systems like the Gaussian and CGS (centimeter-gram-second) systems, which use different units for similar measurements. Understanding these units is essential for fields like electromagnetism, electronics, and telecommunications, where precise calculations are crucial for designing and analyzing systems.