Information stored in RAM can be accessed far faster than information stored in ROM. Thus, a computer might store its boot-up instructions in ROM, but store program files in RAM after initial boot-up.
only rom
Large RAM chips can be read faster than most ROMs since 2007. Sometimes, to allow uniform access, ROM contents need to be coppied to RAM or shadowed before its first use, and be read from RAM.
ram is random access memory and ROM is read only memory
ROM
Ram reads and writes to memory; but upon interruption of power loses all data. ROM reads only memory, but is not dependent on power. Easy examples of RAM and ROM technology: RAM: RAM or memory of your computer, vram (graphics card ram) need power to be accessed (read or written to). ROM: CD-ROM, DVD-rom are mediums that require no power to be read from. However the disc does need a drive drive needing power to spin the disc and power for the laser to read the binary code. But the individual cells don't need power to keep the data. To some extend a harddrive, flash drive, ssd, BIOS chip, CD-DVD RW's are a mixture between both; can be recorded to, and don't need power to retain the data.
RAM is random access memory and ROM is read-only memory.
RAM - Random Access Memory ROM - Read Only Memory
When purchasing a computer, you need only be concerned with the RAM. All computers have ROM, but for the most part, the type or amount of it will make no impact on any aspect of the computer's operation. Since no applications you run are going to rely on ROM for storage, that leaves only RAM.
Ram
rom
The BIOS is stored on ROM.
ROM isn't erased when you turn the power off, whereas RAM is.