Can any one expain to me the difference between the stamp and pic??

The PICs are a familly of microcontrollers having moderately normal
microcontroller-like features (except that they're small, cheap, and
easilly obtainable in small quantities.)

The STAMPs are pre-programmed PIC-based single-board-computers (very small
boards) that store high-level-language bytecodes in a serial eeprom, and
can therefore be programmed and re-programmed in that HLL (nominally BASIC)
easilly from a "host" computer.  It's a neat idea, somewhat akin to the old
magnetic DRUM based machines, only a couple thousand times smaller.  In
addition, Parallax did a good job (IMHO) in coming up with a BASIC-like
dialect useful for the sorts of things people use microcontrollers for.

BillW