A Deterministic Pushdown Automaton (DPA) is a theoretical model used in computer science to recognize certain types of formal languages, particularly context-free languages. It extends the capabilities of a finite automaton by incorporating a stack, which allows it to keep track of additional information during computation. In a DPA, for each state and input symbol, there is at most one action that can be taken, making it deterministic. The DPA processes input symbols one at a time, using the stack to store and retrieve symbols as needed. This structure enables the DPA to handle nested structures, such as parentheses in expressions, effectively. However, unlike a nondeterministic pushdown automaton, a DPA cannot make arbitrary choices, which simplifies its design and analysis.