Itaipu
In short
The Itaipu Dam is a massive hydroelectric power station located on the Paraná River along the border of Brazil and Paraguay. It is one of the largest producers of renewable electricity in the world.
In plain words
It is a huge wall built across a river to trap water. This water flows through turbines to create electricity for millions of homes in Brazil and Paraguay.
A simple example
The dam uses the force of the flowing Paraná River to spin large generators, providing a huge portion of Paraguay's total electricity.
Why it matters
It provides a massive amount of clean, renewable energy for two different countries. It is a key part of the energy security for the entire South American region.
Easy to mix up
Do not confuse it with the Three Gorges Dam in China, which produces more total energy.