The element with the chemical symbol He is Helium. Helium is a colorless, odorless, and inert gas, classified as a noble gas in group 18 of the periodic table. It is the second lightest element, just after Hydrogen, and is most commonly found in natural gas deposits. Helium has several important applications, including its use in party balloons, deep-sea diving mixtures, and as a coolant for superconducting magnets in magnetic resonance imaging (MRI) machines. Due to its non-reactive nature, it's also employed in various scientific and industrial processes where chemical reactivity needs to be minimized.