What kind of data is remained in memory when power is switch off?

When power is switched off, volatile memory, such as RAM (Random Access Memory), loses all stored data, as it requires a continuous power supply to maintain its state. In contrast, non-volatile memory, such as ROM (Read-Only Memory), flash memory, and hard drives, retains data even when power is lost. This means that any information saved on non-volatile storage will remain available upon restarting the device.