What is prototyping in system design phase? Under what condition this approach is most suited? Also what is the disadvantage of prototyping?

Prototyping refers to the process of developing prototypes. Prototype model is most suitable for use when the desired system requires a lot of interaction with the end users. One of the disadvantages of prototyping is the extra funds that is spent on the development of the prototypes. Another disadvantage is the accuracy of the prototype.