Atomic piles, also known as nuclear reactors, are a type of nuclear power plant that uses the energy released from a controlled nuclear reaction to generate electricity. They are composed of a series of interconnected fuel rods, control rods, and moderators, which are arranged in a pile-like structure. The heat generated by the nuclear reaction is used to create steam, which is then used to drive a turbine and generate electricity. Atomic piles have been used since the 1950s to generate electricity for commercial and industrial purposes.