# Challenge Types

**Prediction upload based challenges**: Participants upload predictions corresponding to ground truth labels in the form of a file (could be any format: `json`, `npy`, `csv`, `txt` etc.)

   Some of the popular prediction upload based challenges that we have hosted are shown below:

   <a href="https://eval.ai/web/challenges/list" target="_blank"><img src="../../_static/img/prediction-upload-challenges.png"></a><br />

   If you are interested in hosting prediction upload based challenges, then <a href="./host-challenge.html#host-prediction-upload-based-challenge">click here</a>.

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