Kaggle.com is a website designed for data scientists and data enthusiasts to connect and compete with each other. It is an open community that hosts forums and competitions in the wide field of data. In each Kaggle competition, competitors are given a training data set, which is used to train their models, and a test data set, used to test their models. Kagglers can then submit their predictions to view how well their score (e.g., accuracy or error) compares to others'.
