Okay, so imagine you and your friend are playing together. Sometimes you guys get along really well and have fun together, but other times you might get upset with each other and fight. That's kind of like how Persia (which is now called Iran) and the Ottoman Empire (which is now Turkey) used to be.
A really long time ago, they were both big and powerful empires that were close to each other. Sometimes they would make friends and trade things, but other times they would fight over land or religion.
This went on for a really long time, like hundreds of years. Sometimes Persia was stronger and sometimes the Ottoman Empire was stronger. They even had some big battles that people still talk about today, like the Battle of Chaldiran.
Eventually, both empires got weaker and other countries started becoming more powerful. The Ottoman Empire was even dissolved after World War I, and Persia went through a lot of changes too.
Today, Turkey and Iran are separate countries with their own governments and cultures. But they still have some differences and issues they need to work out from the past.