What does the astronaut backpack do?

The astronaut backpack, officially known as the Extravehicular Mobility Unit (EMU), provides life support and mobility for astronauts during spacewalks. It contains essential systems like oxygen supply, carbon dioxide removal, temperature regulation, and communication equipment. Additionally, it is equipped with a visor for protection against solar radiation and micrometeoroids. Overall, it allows astronauts to operate safely and effectively in the harsh environment of space.