What does this means (Game Object, Vector 3 Position, Vector3 Rotation)

What does this instantiate function do in the Unity engine Instantiate (Game Object, Vector 3 Position, Vector3 Rotation)

As per the documentation:

Clones the object original and returns the clone.

This function makes a copy of an object in a similar way to the Duplicate command in the editor. If you are cloning a GameObject you can specify its position and rotation (these default to the original GameObject’s position and rotation otherwise). If you are cloning a Component the GameObject it is attached to is also cloned, again with an optional position and rotation.

When you clone a GameObject or Component, all child objects and components are also cloned with their properties set like those of the original object.

Note: When this method clones a child object, it also clones the child’s own children. To prevent stack overflow, Unity limits this nested cloning. If you exceed more than half your stack size, Unity throws an InsufficientExecutionStackException.

By default the parent of the new object is null; it is not a “sibling” of the original. However, you can still set the parent using the overloaded methods. If a parent is specified and no position and rotation are specified, the original object’s position and rotation are used for the cloned object’s local position and rotation, or its world position and rotation if the instantiateInWorldSpace parameter is true. If the position and rotation are specified, they are used as the object’s position and rotation in world space.

The active status of a GameObject at the time of cloning is maintained, so if the original is inactive the clone is created in an inactive state too. Additionally for the object and all child objects in the hierarchy, each of their Monobehaviours and Components will have their Awake and OnEnable methods called only if they are active in the hierarchy at the time of this method call.

These methods do not create a prefab connection to the new instantiated object. Creating objects with a prefab connection can be achieved using PrefabUtility.InstantiatePrefab.