関連ワード:  what is software for class 2    what is software for class 2nd    what is software for grade 2    what is application software for class 2    what is system software for class 2    what is computer software for class 2    what is software class 2 answer    what is hardware and software for class 2    what is software short answer for class 2    what is the difference between hardware and software for class 2