GUID Partition Table - Wikipedia
The GUID Partition Table (GPT) is a standard for the layout of partition tables of a physical computer storage device, such as a hard disk drive or solid-state drive, using universally unique identifiers, which are also known as globally unique identifiers (GUIDs).
Windows and GPT FAQ | Microsoft Docs
The GUID Partition Table (GPT) was introduced as part of the Unified Extensible Firmware Interface (UEFI) initiative. The GPT partition format uses version number and size fields for future expansion.