If you are agreeing to something:
* ज़रूर (zarur): This is the most common and direct translation for "sure" in the sense of "yes, definitely."
* ठीक है (theek hai): This means "okay" or "alright" and is a common way to express agreement.
* हँ (haan): This simply means "yes."
If you are expressing certainty:
* निश्चित रूप से (nishchit roop se): This means "definitely" or "certainly."
* बिना शक के (bina shak ke): This means "without a doubt."
If you are asking for confirmation:
* क्या आप सुनिश्चित हैं? (kya aap sunishchit hain?): This translates to "Are you sure?"
The best translation for "Sure" in Hindi will depend on the specific context and what you are trying to convey.