Linear Regression is a supervised learning technique which corresponds to the fitting of a representative line (or a hyperplane) to a set of input/output data points. The goal is to produce a trend line that can help in visual summarization and predictive analysis, and in learning a model that can do accurate and precise predictions of output values in the future. Linear Regression can be used in the business filed to evaluate trends and make estimates and forecasts. Also, it can be used in the medical field to understand for example the relationship between drug dosage and blood pressure of patients, etc.