What is GUID Partition Table ?

 The GUID Partition Table (GPT) is a standard for the layout of partition tables on a physical storage device, such as a hard drive or solid-state drive (SSD), used in computers. It is a more recent alternative to the older Master Boot Record (MBR) partition scheme, which has a number of limitations.

GPT was introduced as part of the UEFI (Unified Extensible Firmware Interface) specification, which aims to replace the aging BIOS firmware interface. GPT has several advantages over MBR, including:

Larger disk support: GPT supports disks up to 9.4 zettabytes, while MBR is limited to 2 terabytes.

More partitions: GPT allows for up to 128 partitions, while MBR is limited to four primary partitions or three primary partitions and one extended partition.

Unique disk signature: Each GPT disk has a unique disk signature, which can help to prevent data loss due to disk-cloning tools that don't properly update the signature.

Backup and recovery: GPT includes a backup copy of the partition table at the end of the disk, which can be used to recover the partition table if it becomes corrupted.

It's worth noting that in order to take advantage of GPT advantages you'll need to have an UEFI based firmware and an operating system that support GPT as well, otherwise MBR is still the default option. Also, as most modern operating systems support GPT, and it is recommended to use GPT as the default partition scheme when setting up a new system, as it can help to prevent data loss and provides more flexibility for partitioning.