Exploring features at the nanoscale or even the atomic scale is a common practice in several nanotechnology-related fields. For example, the field of lab-on-a-chip electronics manufacture is already moving from microelectronics to nanoelectronics. Since transistors with a substantial 3-nm length are now being produced. These transistors are essential components found in practically all electrical devices. Many of them can fit inside a single laptop, smartphone, or even lab-on-a-chip, suggesting that even small variations in size can influence these gadgets. In the meantime, for many years, a variety of sensing, imaging, and detection applications have made use of X-rays and spectroscopic techniques. At the nano and even atomic scales, these well-established instruments are capable of characterizing, identifying chemical structure, and conducting morphological tests on the miniature devices and nanostructures. The method for imaging surfaces at the atomic level utilizing the idea of quantum tunneling would be covered in detail in the first chapter.