DASD - Direct-Access Storage Device (HDD)
ISPF - Interactive System Productivity Facility is a software product for the z/OS operating system that runs on IBM mainframes. It includes a screen editor, the user interface of which was emulated by some microcomputer editors sold commercially starting in the late 1980s, including SPFPC.
SPFPC - Text editor, https://en.wikipedia.org/wiki/SPFPC
MVS - Multiple Virtual Storage is an operating system from IBM that continues to run on many of IBM's mainframe and large server computers. MVS has been said to be the operating system that keeps the world going and the same could be said of its successor systems, OS/390 and z/OS.
z/OS is a 64-bit operating system for IBM mainframes, produced by IBM. It derives from and is the successor to OS/390, which in turn followed a string of MVS versions. Like OS/390, z/OS combines a number of formerly separate, related products, some of which are still optional.
TSO - Time Sharing Option is an interactive time-sharing environment for IBM mainframe operating systems, including OS/360 MVT, OS/VS2 (SVS), MVS, OS/390, and z/OS.
JCL - job control language is a language for describing jobs (units of work) to the MVS, OS/390, and VSE operating systems, which run on IBM's S/390 large server (mainframe) computers. These operating systems allocate their time and space resources among the total number of jobs that have been started in the computer.
CICS - Customer Information Control System is an online transaction processing (OLTP) program from IBM that, together with the COBOL programming language, has formed over the past several decades the most common set of tools for building customer transaction applications in the world of large enterprise mainframe
VSAM - Virtual Storage Access Method is a file storage access method used in MVS, ZOS and OS/390 operating systems. It was introduced by IBM in 1970's. It is a high performance access method used to organize data in form of files in Mainframes.
SPUFI - SQL Processing Using File Input is a database facility invented by IBM for interfacing with their DB2 system. It is accessed from within TSO ISPF from the DB2I Primary Option menu. SPUFI allows direct input of SQL commands in the TSO environment, rather than having them embedded within a program.
SDSF - System Display and Search Facility is a system to monitor and control mainframe Jobs.
File-AID - is powerful editor, It is used to browse, edit, allocate, compare, copie, delete, and print files of any standard MVS access method.For a partitioned database (PDS), you can browse, edit, and copy an individual member or the entire dataset
QMF - DB2, Query Management Facility
PDSE - Partitioned Data Set Extended is a storage management subsystem formatted data set.
Externally, the PDSE is very similar to a PDS. Internally, the PDSE contains a new directory structure, member format, and record format.
A PDSE is indistinguishable from a PDS through most interfaces used to access a PDS directory or member. All ISPF functions support the PDSE.
PDSE do not need be compressed for space to be reclaimed
SMP/E - System Modification Program/Extended is a tool designed to manage the installation of software products on [a] z/OS system and to track the modifications" to those products
SYSPLEX - SYStems comPLEX, refers to a tightly-coupled cluster of independent instances of the z/OS operating system. to help solve the complexity of managing multiple z/OS systems. A Sysplex is a collection of z/OS systems that cooperate using hardware and software functions to process work, providing improved growth potential and higher level of availability.