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Push Down Automata (PDA) are a way to represent the language class called Context Free Languages(CFLs). PDA are abstract devices defined in automata theory. They are similar to Finite Automata(FA), except that they have access to a potentially unlimited amoun of memeory in the form of a single stack. PDA are of two types Deterministic and Non-Deterministic. Every PDA excepts a Formal Language. The language accepted by non-deterministic PDA are precisly the CFLs. If we allow a finite automaton to access two stack instead of just one, we obtain a device much more powerful than a PDA, equivalent to a Turing Machine(TM).

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