Okay kiddo, so "IAEA safeguards" stands for something called the International Atomic Energy Agency safeguards. The IAEA is kind of like a really important group of grown-ups who work together to make sure that countries don't do bad things with nuclear technology, like make bombs.
So when a country wants to use nuclear technology for something like making electricity or medical treatments, they have to follow some rules that the IAEA set up. These rules are called safeguards.
One of the most important things that the IAEA safeguards do is check to make sure that the nuclear materials, like uranium or plutonium, that are used for peaceful purposes, aren't secretly being used to make bombs.
To do this, the IAEA people visit the places where nuclear stuff is being used, like power plants or research centers, and they look at things like how much nuclear material is there and whether it's being used the way it's supposed to. They might also take samples of the material to check whether it's the right kind and not being used to make bombs.
All of this checking and measuring is really important to make sure that nobody is secretly making bombs and to keep us all safe from the dangers of nuclear weapons.