Discussing Cellular Automata in detail

1. What is Cellular Automata?Waht is its use?How is it different from switching automata?Explain.
2. What is use of Cellular Automata for discrete time models and their simulation?Explain
3. Write a Simulator for one–dimensional cellular automata. Compare the direct approach that scans cell all the time with the discrete event approach in terms of execution time.
4. Compare the cyclic behavior of the Rossler,Vanderpol, and second linear oscillator