Memdump A display or printout of all or selected contents of RAM. After a program abends (crashes), a memory dump is taken in order to analyze the status of the program. The programmer looks into the memory buffers to see which data items were being worked on at the time of failure. Nmap Nmap is a network scanner created by Gordon Lyon. Nmap is used to discover hosts and services on a computer network by sending packets and analyzing the responses. Nmap provides a number of features for probing computer networks, including host discovery and service and operating system detection.