Overview
The 
Copy node copies one piece of geometry onto the points of another piece of geometry.
This is very useful for lots of effects, such as snow (copying flakes onto falling points), forests (scatter points on a ground surface and copy trees to them), cities (establish a grid of points and copy buildings to them), and so on.
Copying is similar to instancing, except copying creates real geometry you can manipulate further, allows stamping, and lets you create copies with unique attributes.
How to
Useful nodes
 Scatter
| Scatters points randomly and evenly across a surface or surfaces. This is very useful for creating points on the surface to copy source geometry onto. For example, you can scatter points across “rolling hills” geometry and instance trees onto the points. |
 Delete
| Lets you delete points according to various criteria, such as every Nth point, or the last N points, and so on. By animating Deletion of points, you can add or remove copies. |
 Point
| Sets attributes on points. The Copy node will pick up certain attributes on the points it copies to and use them to change the copy. See instancing point attributes. |