Master Boot Record (MBR) and GUID Partition Table (GPT) are two different partitioning schemes that you can use for your SSDs and HDDs. They play a vital role in managing the disk structure, and determining how the data is stored or accessed. MBR dates back to the 80s, meaning it works well with older computers with legacy BIOS firmware, whereas GPT is a more modern alternative that was developed as a part of the Unified Extensible Firmware Interface (UEFI).