Attachment lens, macro lens or diopter. Regardless of what you call it, its main purpose is to bring objects into focus closer.
Diopters are the simplest  and an inexpensive way to get macro shots using your standard favorite lens. 
Diopters are indispensable for food and product photography
Characteristics: 
Diameter: 138 mm
Anti-glare: Yes
Use more than one filter: Yes
Loss of light intensity: No
You can use several diopters at once. At the same time, their magnifying power will be summed up. For example, if you use +1 and +2 diopters at the same time, the magnifying power will be +3