system date field definitions

[Anonymous]

Would someone please define the following for me, or point me to a document that contains definitions?
Created At
Acquisition Date

[Josh_Hill13]

Created At is the original date and time of the lead created.
Acquisition Date is the time and date the lead was first acquired by a Program.

I believe Created At may often be older than Acquisition because it could go back to the Anonymous time - when they were first cookied. So you'll see Created At and SFDC Created Date.