As a well-known application virtualization tool - i.e. the single-executable/portable software builder, VMware ThinApp is actually the former Thinstall Virtualization Suite which was later acquired by VMware. It can also be simply interpreted as one packaging suite for software and its complete running environment.
For system administrators or advanced computer users, most often, we need to quickly and efficiently deploy/install the same one or a set of software (especially all kinds of necessary system components, such as: Visual C++ Redistributable Packages, DirectX End-User Runtimes, Microsoft .NET Framework, Microsoft XNA Framework Redistributable...) on many computers. This kind of need can be met by a technique called software installation automation (AKA: unattended install or silent install).
For junior or senior computer users, operation system reinstallation is often a necessary but trouble thing (such as: no OS installation disk; laptop without CD/DVD ROM; too long installation time ...). But from now on, you do not have to think of installing your computer OS using the outdated CD/DVD, just remember one tool - Universal USB Installer!
With Clonezilla, you can clone/restore the whole disk or some partition of various operation systems (32-bit & 64-bit), such as Windows, Linux, Intel-based Mac OS X, FreeBSD, NetBSD, OpenBSD, Minix, VMWare ESX and so on. What you need is just a bootable CD/DVD or USB flash drive, and then run Clonezilla.