A polo neck is a kind of shirt that has a long, high collar that goes up to your neck. It's like a turtleneck but not as tight. It is named after the sport of polo, where the players wear shirts with similar collars to protect their necks from the sun. Some people wear polo necks for fashion, while others wear them to keep warm. They are often made of soft and stretchy materials like cotton or wool, and can be worn with jeans or skirts. So, just imagine a shirt that goes up really high on your neck and you'll know what a polo neck is!