To put it simply, macro photography is close-up photography. There are various schools of thought on when a photo becomes a macro (when it’s close enough) but most have agreed to disagree on the exact details of this grey area. They have agreed though that when an image projected on the camera sensor is at least the same size as your subject this is defined as macro photography. We give this term a 1:1 magnification ratio.
If you haven’t done so already, you can take the free “Introduction to Photography ” course where you’ll find 4 lessons on macro photography.
Here are some macro photo examples: