Machine learning is a broad field that encompasses many different techniques and algorithms, but many of these techniques are indeed based on linear regression . Think of it this way: Imagine you have a complex problem, like predicting the stock price of a company. You might break down this problem into smaller, simpler problems that can be solved using linear regression. For example, you might try to predict the stock price based on factors such as the company's earnings, the overall state of the economy, and recent news about the company. Each of these factors can be modeled using a separate linear regression, and the outputs from these regressions can then be combined to make a prediction about the stock price. So, in this sense, machine learning can be thought of as a collection of many linear regressions working together to solve a more complex problem. The idea is that by breaking down a complex problem into simpler parts and modeling each part with a separate regression, the...