A simple aromatic ring is like a little circle made up of tiny atoms. The atoms are all stuck together really tightly, so they don't fall apart easily. It's kind of like if you made a bracelet out of really strong glue and beads - once you put it together, it's hard to take apart!
This tiny circle is made up of carbon and hydrogen atoms. The carbon atoms are all connected to each other in a straight line, and the hydrogen atoms stick off of the carbon atoms in different directions. This creates a little pattern of atoms that looks kind of like a hexagon (six-sided shape).
When scientists look at the atoms in the circle really closely, they see that the electrons (tiny things that spin around atoms) are moving around in a special way. They're kind of spinning in a circle too, which makes the whole circle of atoms act and look very special.
Scientists have also found that things like smells and colors can be created by different types of circles made up of different atoms. So, aromatic rings like this can be used in things like perfume and medicine to create smells or help our bodies in different ways.