Before revision: Simulation was initially done simulating logic gates in chips but later, RTLs in chips were simulated URL Simulation is still used in analog chip URL Prototyping platforms are used to run software on prototypes of the chip design while it is under development using FPGAs but are slower to iterate on or modify and can't be used to visualize hardware signals as they would appear in the finished design.
After revision: Simulation was when creatingitially done simulating logic gates in chips but later, RTLs in chips were simulated URL Simulation is still used in analog chip URL Prototyping platforms are used to run software on prototypes of the chip design while it is under development using FPGAs but are slower to iterate on or modify and can't be used to visualize hardware signals as they would appear in the finished design.