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Master Boot Record (MBR)

The Master Boot Record (MBR) is the information in the first sector of any hard disk or diskette that identifies how and where an operating system is located so that it can be boot (loaded) into the computer's main storage or random access memory. The Master Boot Record is also sometimes called the "partition sector" or the "master partition table" because it includes a table that locates each partition that the hard disk has been formatted into. In addition to this table, the MBR also includes a program that reads the boot sector record of the partition containing the operating system to be booted into RAM. In turn, that record contains a program that loads the rest of the operating system into RAM.

This was last updated in April 2005

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Thanks for the definition, it was understandable and educational :) But, it doesn't mention another partition style - GPT and what's the difference between them. In brief, GPT is newer and superior to MBR. GPT disks are gaining popularity with their benefits in terms of partition size, number of partitions, and resilience. Learn more: http://www.disk-partition.com/gpt-mbr/difference-between-mbr-and-gpt-1203.html
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Margaret Rouse never makes her content understandable or it is poorly written. A lot of her posts don't really help you understand the content.
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what booting tell me expling and what process of booting
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