Iteration is the repetition of a process in order to generate a sequence of outcomes. In mathematics and computer science, iteration is a standard element of algorithms. Iteration may refer to the process of iterating a function, i.e. applying a function repeatedly, using the output from one iteration as the input to the next. Iteration of apparently simple functions can produce complex behaviors and difficult problems. In computing, iteration is the technique marking out of a block of statements within a computer program for a defined number of repetitions. Iterative development is sometimes called circular or evolutionary development, and each single pass through the sequence to complete all the steps in the given order is known as an iteration. Any iterative process is the practice of refining and improving a product, process, idea, or initiative through multiple iterations. In iterative software development, an application is developed in small sections called iterations. The goal of the process is usually to refine or tweak the latest version or iteration of the product to make a subsequent version that better meets the products goals and objectives.