Some advantages of optical fibers with regard to sensing include their small size, no requirement of electrical power at the remote location, and many sensors can be multiplexed along the length of the fiber by using light wavelength shift for each sensor, or by. Some advantages of optical fibers with regard to sensing include their small size, no requirement of electrical power at the remote location, and many sensors can be multiplexed along the length of the fiber by using light wavelength shift for each sensor, or by. (This article belongs to the Special Issue Optical Fiber Technology and Sensors) Optical fiber sensors present several advantages in relation to other types of sensors. These advantages are essentially related to the optical fiber properties, i., small, lightweight, resistant to high temperatures. This is the power of fiber optic sensing, a technology that transforms ordinary optical fibers into the digital world's sensory network. The impact of infrastructure failure can be devastating, resulting in loss of life, economic damage, and. We present here the recent advance in exploring new detection mechanisms, materials, processes, and applications of fiber optic sensors. Far beyond its origins in telecommunications, FOS now provides critical data across sectors, from safeguarding infrastructure to advancing environmental conservation.