 SNA is a uniform set of rules and procedures for computer communications to free computer users from the technical complexities of communicating through local, national, and international computer networks.SNA became the most widely used system for data processing until more open architecture standards were approved in the 1990s.In 1975, IBM researcher Benoit Mandelbrot conceived fractal geometry—a new geometrical concept that made it possible to describe mathematically the kinds of irregularities existing in nature.