The term macro lens is used for lenses that have a close focusing range and an ability to produce a life-size reproduction of anything that is trained at on the image plane; i.e., the sensor/film. Please note there are lenses that are labeled as a macro but they are not true macro lenses because they don’t produce a true life-size reproduction.
You would often see such lenses packaged with the following terms mentioned – maximum reproduction ratio 1: X. With X being any number other than 1. 1:1 signifies life-size reproduction. It means the lens is a true macro lens.
True macro lenses are sought after by product photographers and those doing macro photography as a hobby. The true advantage of using these lenses is you can work from great distances and yet be able to focus without issues.