overfitting
Overfitting is the curious disease of machine learning models that memorize every nuance of training data at the cost of any real-world adaptability. It sacrifices the friendship called generalization on the altar of statistical perfection. Like a student who masters past exam questions yet flunks the actual test, it shines in theory and collapses in practice. Mathematically, it boasts an ideal fit; pragmatically, it becomes a useless work of art. It is the holy ground where a model’s vanity collides with reality’s harsh irony.