they are important because animals inthe savanna need them to survive
Great Plains and California, US. Serengetti, Congo, Angola, Africa. South and Central America and the caribbean. Australia and New Guinea. The greatest area of savannas is Africa.
It is a hot, seasonally dry grassland with scattered trees. It is intermediate between a grassland and a forest.
The term was originally used for tropical grasslands. It is a little broader now, but in essence it still means grasslands.
They're in Africa because the climate in Africa supports the wildlife that lives there.