Africa
In short
Africa is the world's second-largest and second-most populous continent, covering about 20% of Earth's land area.
In plain words
It is a massive landmass with many different countries and cultures. It has a very young population compared to the rest of the world.
A simple example
A person living in Cairo, Egypt, is living on the African continent.
Why it matters
Its huge and growing population means it will play a massive role in global economy and politics in the future. It also contains vast natural resources.
Easy to mix up
Do not confuse the continent of Africa with the country of South Africa.