People in general learn better by doing tasks using their tactile skills, as Piaget, Dewey and Montessori proposes. Realia is immensely useful for all ages but for young learners who cannot use theoretical knowledge and acquire information through texts, it is more important to use real life stimulants. But in some cases real life stimulants are hard to come by for the teacher, be it because economical, practical or circumstantial reasons. 

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Because of the shortcomings that the teacher cannot control, we sometimes might need to simulate certain things. And lucky us, we are in an age of technology and simulation, which our learners were born into and familiar with.