In supervised learning, the algorithm learns from labeled data, where the outcome or target variable is known. In unsupervised learning, the algorithm learns from unlabeled data, where the goal is to identify patterns and relationships in the data. In reinforcement learning, the algorithm learns through trial and error by interacting with an environment and receiving feedback in the form of rewards or penalties.
Machine learning has a wide range of applications, from image and speech recognition, to natural language processing, recommender systems, fraud detection, and predictive maintenance. It is increasingly being used in industry and research, and has the potential to transform many aspects of our lives.