The present chapter investigates electron. It is shown that electron has an intricate internal structure which determines both static and dynamic properties of the electron itself and important parameters of te condensed matter. Stationary “cold” electron (≤0.1eV) is modeled by a thin elastic ring called ector having diameter which is 137,036 times larger Bohr’s radius of hydrogen which consists of specific form of magnetic field. On the basis of the ector model the size, mass, charge, electromagnetic mass, spin and magnetic moment of electron are described. The model of “cold” ring electron in a condensed matter explains from new perspective critical parameters of phase transitions “metal-semiconductor” (Winner’s crystallization) and low temperature and high temperature superconductivity. Ring electron spirals into a void torus as compared to steady moving “hot” electrons (>>0.1эВ). The size of the torus depends on its kinetic energy which makes it possible to describe changes of the cross-section of the interaction with gas – Ramsauer effect. The model of ring electron transforming onto the torus also makes it possible to construct a hydrogen atom and describe energy states of the atom including its spectrum, process of emission/absorption, size of the atom and its stability. The model of the toroid electron explains correlation of the change of the interacting cross-section of relativistic electron with accelerating electro-magnetic wave up to complete disappearance of the interaction called disruption in the energy spectrum of cosmic electrons. Very high coincidence degree with the experimental data and simplicity of formulas testify to the adequacy of the employed model.