Physical barriers are the first defense systems for physical securities (Prevention of any physical attacks such as theft, robbery, terrorism and similar). The topic considered can be divided into two categories: environmental barriers and man-made barriers (Fennelly, 2016). Environmental barriers are those barriers provided by nature while man-made barriers fall into the category of man-made barriers. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay Environmental barriers such as mountains, cliffs, rivers or canyons are very useful in large manufacturing facilities (B2B-Business to business). Environmental barriers for large facilities (particularly power plants) make trespassing difficult as well as protecting civilians in the event of radiative leaks from the station (Martinez-Medina et al., 2016). Even unprofitable services such as prisons and research laboratories receive a huge boost from the former and thus are adopted worldwide. However, these barriers can be of great disadvantage for structures offering B2C (Business to customer) services. So, depending on the type of facility, facilities should choose a location that offers environmental barriers. Human-made barriers (such as fences, walls, security systems, lighting and more), unlike environmental barriers, can be adopted in any facility. The first is the most important mode of the physical barrier as it offers barrier protection depending on the needs. Ordinary fences or walls can provide barrier protection to homes and moderate industries (Fennelly, 2016). On the other hand, barbed wire and electrified fences can be equipped for the defense of high-security bases such as prisons, research laboratories, government offices and others. An additional offering of man-made barriers is that they are updated with the arrival of new technologies that make the structure safer. References1. Finocchio, L. (2016). Effective physical security. Butterworth-Heinemann. Please note: this is just an example. Get a custom paper from our expert writers now. Get a custom essay2. Martinez-Medina, A., Flors, V., Heil, M., Mauch-Mani, B., Pieterse, C. M., Pozo, M. J., & Conrath, U. (2016). Recognize the trigger of plant defense. Trends in plant science, 21(10), 818-822.