Fiber Optics are a medium for transmitting light. Think of having a garden hose five hundred meters long. When looking through it you are able to see 50% of the light. Now you understand the power of fiber optics. The wide variety of fiber optics presently available has advanced its use for sensing, process control and laser delivery applications. However, there is a strong need to understand fiber optics at the basic level. The focus of this paper will discuss the basics of fiber optics for step-index fibers.