PSPACE

PSPACE is a classification in computational complexity theory that describes the set of problems which can be solved by a computer using an amount of memory (space) that is limited to a polynomial function of the input size. In other words, these problems can be efficiently handled in terms of memory, even if they might take a long or complex time to solve. PSPACE problems include many difficult tasks, but their key characteristic is that the space (memory) needed stays manageable relative to the input, making them a fundamental class in understanding computational resource requirements.