If we look into the Bohr's atomic model, it is like a staircase.
Where every next orbit is like a stair.
As we can not rest in air, we either have to stay on level 1 or can go up with enough energy to climb next level.
Same way, electron can either stay on one orbit or can go to higher orbits with enough energy to jump from lower energy level to the higher energy level, can say orbit.
According to Bohr, atom is a system consisting of a dense nucleus surrounded by orbiting electrons.
He compared his atomic structure with the structure of the Solar System.
To know more about Bohr's atomic model:
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