The element represented by the symbol 'He' is helium. Helium is the second lightest and second most abundant element in the universe, primarily formed through nuclear fusion in stars. It is a colorless, odorless, noble gas that is non-toxic and non-flammable, making it safe for various applications. Helium is primarily used in balloons, cryogenics, and as a cooling medium for MRI machines, due to its low boiling point and excellent thermal conductivity. It also plays a key role in scientific research, including studies of quantum mechanics and plasma physics.