A linac, or linear accelerator, is a device that uses electromagnetic fields to accelerate charged particles, such as electrons or protons, to high speeds. These particles are then directed towards a target for various applications, including medical treatments and scientific research. In medicine, linacs are commonly used in radiation therapy to treat cancer by delivering precise doses of radiation to tumors. In addition to medical uses, linacs are also employed in research facilities, such as particle physics laboratories, to study fundamental particles and forces. They can generate high-energy beams for experiments, contributing to our understanding of the universe. Linacs play a crucial role in advancing both healthcare and scientific knowledge.