Understanding target layer and source layer in Select By Location of ArcGIS for Deskt

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I have a lab assignment that i would need some help with. I have a 25km buffer that's in a circle. Within that i am supposed to make a map were the berries that people can pick are. The assignment is to put in some "demand" that needs to be fullfilled to be in the buffer. I have a layer with vegetation that contains many different vegetation codes. I have made a Selection > Select By Attributes and exported the data with only the vegetation codes that i need.

The problem comes when i run Selection > Select by location. What is the target layer and what is the source layer? I don't understand what the difference is? What is the "acive" layer and what is the "search layer"?



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