Quantum computing has been a topic of research in academia for well over three decades. However, only in the past ten years did global markets follow that trend, investing millions into research. This is due to the belief that quantum computers could harness the power to solve problems that today s supercomputers can barely simulate. While some progress has been made, we are still years away from quantum computers reaching their full potential. Bulding them is an intricate task, and operating on them isn t further behind: decoherence, error correction and scalability are three of the many challenges the field of quantum computing faces. The aim of this work is to introduce quantum computing from a theoretical point of view, and examine the market share of the field given the recent increase in investments. It also discusses three of the most popular methods of fabricating quantum computers: photonic, superconducting and electron spin quantum dot computers. We also discuss advantages each has over the other, acknowledging that we are still in the noisy intermediate scale quantum era.