The core function of a computer's RAM (Random Access Memory) is to provide temporary storage for data that a computer is actively using. This allows the CPU to quickly access and process information without the delays associated with retrieving data from permanent storage devices like hard drives or SSDs. More RAM generally enables a computer to run multiple applications simultaneously and improves overall system performance. As volatile memory, RAM loses all stored data when the computer is powered off, making it essential for short-term tasks and operations.