Machine learning is a subfield of artificial intelligence that involves the development of algorithms and statistical models that enable computers to learn from data without being explicitly programmed. The main goal of machine learning is to build predictive models or classifiers that can make accurate predictions or decisions based on new data. Machine learning algorithms work by analyzing data and identifying patterns or relationships within it. This is done through a process of training, in which the algorithm is fed a large dataset and uses statistical techniques to identify the patterns that are most likely to be useful for making predictions or decisions. Once the algorithm has been trained, it can be used to make predictions or decisions on new data. This is known as inference or prediction, and it involves applying the trained model to new data and using the patterns identified during training to make predictions or decisions. There are many different types of machine learning algorithms, including supervised learning, unsupervised learning, and reinforcement learning. Supervised learning involves training a model on labeled data, where the correct outcomes are known. Unsupervised learning involves training a model on unlabeled data, where the goal is to identify patterns or relationships within the data. Reinforcement learning involves training a model to make decisions based on feedback received from the environment. Overall, machine learning is a powerful tool for making predictions and decisions based on data, and it has many practical applications in areas such as image recognition, natural language processing, and financial modeling.