What is Overfitting
A model failure mode where it learns training data too closely and performs worse on new examples.
Definition
Overfitting is a model failure mode where it learns training data too closely and performs worse on new examples. In practical AI work, it helps teams connect a concept to data, model behavior, product choices and evaluation. The useful question is not only what the term means, but how it affects quality, cost, reliability and risk in a real workflow.
Example
A team uses Overfitting to choose a model, design an experiment, compare alternatives or check whether an AI tool fits the task.
Why it matters
Overfitting matters because model failure mode where it learns training data too closely and performs worse on new examples can change how teams build, evaluate or choose AI systems.
How it works
Teams prepare data, train or tune a model, validate it on held-out examples and compare it with simpler baselines. For Overfitting, the key is to connect the definition with input data, assumptions, measurable outcomes and deployment limits.
Where it is used
- Used in training, validation, optimization, classification, clustering, reinforcement learning and model selection.
Limitations
A good score in one dataset does not guarantee stable behavior in production or on new user data.