A comprehensive overview, this book focuses on two directions of study: discovery of new effects that take place in magnetic wires and optimization of the magnetic, electrical, and mechanical properties of the wires, taking into account the technological application. The book presents the idea of moving to nanoscale, maintaining the achieved optimal parameters of microwires. While the focus remains on glass-covered wires of micrometer scale, it covers the first steps of the movement to "nano" range as an example of the versatility of the basic effects initially discovered for microscale.