What is the purpose of the spacesuit?

space suit is provided to astronauts to prevent astronaut's body from blasting due to unbalanced atmospheric pressure.the atmospheric pressure inside the space suit is set according to the atmosphere of space.while the space flight is launched the flight goes to space crossing many layers of earth atmosphere with a great speed,at this time the astronauts have to cross many layers of different densities and atmospheric pressure,at this crucial time the space suit plays an important role by saving the astronauts body