Cross-platform development refers to the development of software for working on a machine that is significantly different from that used by the developer. For example, there are many useful programs that run on processors with 128 bytes of RAM or less and 4 KB of ROM or less; for example, the PIC microcontroller of the popular 16C54, which includes offers of 25 bytes of RAM and 768 bytes of ROM, is used in many small things, such as remote control, device timers, etc. It is almost impossible to edit the code for 16C54 on 16C54, so instead, the programmer (person) will develop the code on something like a PC and use a device called a programmer to copy the code to the microcontroller. Chip.
Cross-platform development refers to the development of software for working on various machines. This, obviously, contains an essential element of cross-platform development (since the development machine is likely to correspond to only one of the machines for which the software is written), but a lot of cross-platform development is aimed at one specific machine and, multi-platform development.
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