Memory – (In terms of Interactive TV & computers) - The term “Memory” is most often used to indicate physical data storage areas in the form of computer chips.  The word “Storage” is typically used for a physical data storage area existing on disks and tapes.  “Storage” areas of the computer keep their data after the computer is turned off, where most often “memory” areas of the computer lose their stored data when the computer is turned off.
      A computer’s “physical” memory is called its “main memory” (RAM, SDRAM, DRAM, etc.)  However there are computer chips that store inputted information whether the computer’s on or not. These include ROM and PROM.  (1) ROM (Read Only Memory;) the ROM typically stores instructions used to start up the computer.  Unlike RAM, you cannot change the particular instructions on a ROM chip.  (2) PROM - (Programmable Read Only Memory.)  This is a memory chip on which you can store a program.  Once the PROM is programmed, it can’t be changed.