Difference between Unmanaged & Undefine Nodes

Hi Team,

Can you please guide me about the terms "Unmanaged & Undefine" which is used in SolarWinds. What both words define about the nodes.

Secondly, Is there any way to find the exact date of any unmanaged nodes. Means is there anyway from where I can get to know that from this date, this device/nodes are unmanaged.