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Answer : Extravehicular Mobility Unit.

Explanation :

EMU stands for Extravehicular Mobility Unit in the context of NASA’s spacesuits. It refers to the specialized suit designed for astronauts to wear during spacewalks (extravehicular activities, or EVAs). The EMU provides life support, protection from the vacuum of space, temperature regulation, and mobility, enabling astronauts to work outside their spacecraft in harsh environments like low Earth orbit or the Moon.

Why not Extravehicular Maneuvering Unit?
This is a common mix-up; the Extravehicular Maneuvering Unit (EMU) was actually the name of the Manned Maneuvering Unit (MMU), a nitrogen-propelled backpack used by astronauts during early Shuttle EVAs in the 1980s for free-flight maneuvering away from the orbiter, but it is not the name of the spacesuit itself.