It’s a very simple but most of the students even some school level teachers are also do not know!

Let’s know ,actually what it is?

(85.68% science ‘n’65.43% arts students coundn’t explain it)   

Letters with dates
BC, we have seen stands for ‘Before Christ.’
You will sometimes find AD before dates. This
stands for two Latin words, ‘Anno Domini’, meaning
‘in the year of the Lord’ (i.e. Christ). So 2005 can
also be written as AD 2005.
Sometimes CE is used instead of AD and BCE
instead of BC. The letters CE stand for ‘Common
Era’ and BCE for ‘Before Common Era’. We use
these terms because the Christian Era is now used
in most countries of the world. In India we began
using this form of dating from about two hundred
years ago.
And sometimes, the letters BP meaning ‘Before
Present’ are used.