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Semiconductor memory uses semiconductor-based integrated circuits to store information.There are basically two types of semiconductor memory: random access memory(RAM) and Read only memory(ROM).
The RAM: random access memory contains chips that are mostly used for primary storage medium.Each memory position can be both sensed (read) and changed (written), so its also called read/write memory.This is a volatile memory.
The ROM: read only memory is simply a nonvolatile memory. Read only memory contains chips that are used for permanent storage.ROM can be read but not erase or overwritten.
It should be noted that frequently used control instructions in control unit and primary storage can be permanently burned into the storage cells during production.So the content of semiconductor can always be burned permanently to avoid deletion via loss of power.