It is the record of activities of system up to a certain date; but it should have enough details to track back sequence of events that go from the beginning of transaction to the end. Card holder Data (CD) Cardholder data contains full Primary Account Number (PAN).
It is an environment containing all the processes and technology including the people that process, transmit or store customer cardholder information or authentication information. CDE also includes connected system components and virtualization technology like applications, servers etc.