Formal:
* ठीक है (theek hai): This is the most common and literal translation of "okay."
* सही है (sahi hai): This means "correct" or "right" and can also be used to mean "okay."
Informal:
* चलो (chalo): This means "let's go" but is often used to mean "okay" in informal situations, like agreeing to something.
* हम्म (humm): This is a simple affirmative grunt, similar to "uh-huh" in English, and can also be used to mean "okay."
* ठीक (theek): This is a shortened version of "ठीक है" and can be used in informal contexts.
The best way to choose the right word depends on the situation. For example, "ठीक है" is appropriate in most situations, while "चलो" is more informal and can be used with friends or family.