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what is difference between until and till ?
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In meaning, none.

I personally find that "till" sounds slightly more informal (or in some contexts, more poetic, which may seem like a contradiction), though some usage guides insist that it isn't.
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I personally find that "till" sounds slightly more informal (or in some contexts, more poetic, which may seem like a contradiction), though some usage guides insist that it isn't.

That's right. The word till has numerous advocates. These are they who vouch for the use of till

for all occasions in which until could be used. Advocates feel part of a problem goes back to confusion between till and the word 'til, which is a contraction. Contractions are usually afforded lesser status by writers of formal and business English, though they continue to thrive in conversational use.