The Arc Reactor has played a huge role in the MCU, first appearing in 2008’s Iron Man and ultimately serving as a symbol of Stark’s transformation from a greedy billionaire into a selfless tycoon. It’s a highly-advanced piece of technology that uses electromagnets to create an immense power source, and beyond the destructive weapons and powerful family legacy, its Stark Industry’s most important and memorable creation. Tony’s infamous Iron Man suit incorporates the Arc Reactor into its design, but it’s easy to miss exactly why he needs this device in the first place.
https://screenrant.com/mcu-tony-stark-iron-man-arc-reactor-alive/
