No, popcorn is not a fruit.
Popcorn is classified as a grain. More specifically, it is a whole grain. This means that when you eat popcorn, you are consuming the entire grain kernel, including the bran, germ, and endosperm. Fruits, on the other hand, develop from the flower of a plant and contain seeds. While corn kernels do contain a small germ (which could be considered a seed in a way), the overall structure and development of corn place it firmly in the grain category.
Essentially, you are eating a dried seed, which fits the description of a grain better than a fruit.
