Hiren's Boot CD is a boot CD containing various diagnostic programs such as partitioning agents, system performance benchmarks, disk cloning and imaging tools, data recovery tools, MBR tools, BIOS tools, and many others for fixing various computer problems. It is a Bootable CD; thus, it can be useful even if the primary operating system cannot be booted.
Hiren's Boot CD has an extensive list of software. Utilities with similar functionality on the CD are grouped together and seem redundant; however, they present choices through UI's differences and options in what they can do.

Hiren's BootCD is a wonderful live CD containing various programs such as Hard drive recovery, Hard Drive Partition, Hard Drive Backup, Hard Drive Testing, RAM (Memory) Testing, System Information, MBR (Master BootRecord), BIOS, MultiMedia, Password, NTFS (FileSystems), Antivirus, AntiSpy, Process, Windows Startup, Registry tools, Windows Cleaners, Optimizers, Tweakers, and many others... As it is a bootable CD, it can be useful even if the primary operating system cannot be booted. We may call it as an emergency cd which every computer technician or home user must have.