What is the purpose of crop?

"Crop" can refer to a few different things, so I need a little more context to understand what you're asking.

Do you mean:

* The act of cropping: This is the process of cutting or trimming something, like a photo or a video. The purpose of cropping is to remove unwanted parts and focus on the desired subject matter.

* A cultivated plant: This refers to a plant that is specifically grown for food, fiber, or other uses. The purpose of a crop is to provide sustenance, materials, and economic value.

* A group of things: This is less common, but "crop" can be used to describe a group of something, like a "crop of new books".

Please tell me more about what you're interested in so I can give you a more specific and helpful answer!