# Glossary

## Glossary

The definitions below are related to this document and are provided for quick reference.

### Bash

A UNIX shell used for entering command-line executions. Included with most Linux distributions and macOS. Includes SSH capability.

### Hypervisor

Also known as a *virtual machine monitor*, a hypervisor is software/hardware that creates, runs, and manages virtual machines.

### Virtual Machine

An operating system instance that runs on top of a hypervisor. Multiple virtual machines (VMs) can run at the same time on the same physical host.

## Acronyms

### CLI

Command-Line Interface

### DTN

Delay-Tolerant Network

### GPU

Graphics Processing Unit

### GUI

Graphical User Interface

### LDAP

Limited Lightweight Directory Access Protocol

### MPI

Message Passing Interface

### NFS

Network File System

### PBS

Portable Batch System

### S3

Simple Storage Service

### SFTP

Secure/SSH File Transfer Protocol

### HPC

High-Performance Computing/Cluster

### SSH

Secure Shell

### VM

Virtual Machine