Solution:
The full form of AD is Anno Domini, which is Medieval Latin for 'year of the Lord'. BC (Before Christ) and AD are used to label years in the Julian and Gregorian calendars. This era is based on the traditional year of Jesus' birth. AD counts from this epoch, while BC denotes years before. Developed by Dionysius Exiguus in 525, it became widely used after 800.
The Gregorian calendar, used globally today, has been crucial for international communication, transportation, commerce, and is recognized by institutions like the United Nations. To get more information click here -
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