Cache oblivious data structures are types of data structures (like a list or a stack) that can be used to store and organize data. The special thing about cache oblivious data structures is that they are designed to work well with computer memory, which can often be tricky to understand and work with. With cache oblivious data structures, you don't have to think about how your computer's memory works - the data structure already knows how to store and organize information so that it runs smoothly and quickly on your computer.