What type of memory can be erased and rewritten electronically without a power source?

Flash memory is a type of nonvolatile memory that can be electronically erased and rewritten, making it a popular choice for various storage applications like USB drives and solid-state drives. Unlike volatile memory, such as Random Access Memory (RAM), flash memory retains data even when the power is turned off, which is essential for preserving information and allowing it to be accessed later.

Nonvolatile memory is a broader category that includes several types of memory storage, including flash memory, but it's the specific characteristics of flash memory that highlight its ability to be erased and rewritten electronically. Therefore, while nonvolatile memory provides the overarching classification, it is flash memory that specifically meets the criteria of being able to be rewritten without a power source.

BIOS memory typically refers to a type of nonvolatile memory where firmware is stored, but it does not have the same capacity for frequent erasing and rewriting as flash memory.