Platform Games Queastions

1. What is a platform game:  It a game where the game play mainly is center around running and jumping onto platforms to advance the level.
2. When did they appear: They appeared in the early's 80's but it was made popular by the mid 1990's by of the sudden boom  of arcades 
3. Why is the platform game one of the most popular game genres: i was because 
4. Do platform games have a specific target audience, what age range and demographics does the platformed appeal to?
5. Name and analyse 3 of the most popular Platform games, why are they so popular and what is the unique selling point of these games?