Until, till, and 'til are all used in modern English to denote when something will happen. Until and till are both standard, but what might be surprising is that till is the older word. 'Til, with one L, is an informal and poetic shortening of until. The form 'till, with an additional L, is rarely if ever used today.

Where do we use till?

Till is often used in informal spoken English as a short form of until. Some people also use 'til. We waited till 3 o'clock. I'm not leaving till you apologise.

Where do we use till and until?

Until indicates when something will happen, begin, or end. Till means the same thing as until. Till is not an abbreviation of until—it's actually older than until—and it should not be written with an apostrophe.