What is line of best fit and what does it look like?

The line of best fit, also known as the regression line, is a straight line that best represents the data points in a scatter plot. It is calculated to minimize the distance between the line and all the points, typically using the least squares method. Visually, it appears as a line that trends in the direction of the overall data pattern, either ascending or descending, and can be used to make predictions about future data points based on existing trends.