What fried item is usually served as a side order at McDonald's?

French Fries are the iconic side order at McDonald's and are a key component of their menu. Known for their crispy texture and salty flavor, they are often enjoyed with a variety of burgers and sandwiches. Their popularity has made them a staple item, recognized globally as synonymous with the McDonald's experience.

While other options like onion rings, potato wedges, and chips may be served in different fast food contexts, they do not hold the same iconic status at McDonald's as French Fries do. French Fries have been a foundational part of McDonald's offerings since its early days, contributing significantly to the restaurant's identity and customer satisfaction. This deep-rooted tradition helps explain why French Fries are the correct answer to this question.