Formal:
* मुझे समझ में आ गया (mujhe samajh mein aa gaya): This is a very common and polite way to say "I understand." It literally means "It came to my understanding."
* मैं समझ गया (main samajh gaya): This is another formal option, directly translating to "I understood."
* मैं समझता हूँ (main samajhta hoon): This phrase is more nuanced and means "I understand" in a sense of comprehending the meaning or situation.
Informal:
* समझ गया (samajh gaya): This is a more casual and direct way to say "I understand."
* ठीक है (theek hai): This literally means "okay" and is often used to acknowledge understanding, particularly in informal settings.
* हाँ (haan): This simply means "yes" and can be used to indicate understanding in some situations.
Other variations:
* मैं समझ सकता हूँ (main samajh sakta hoon): This means "I can understand" and suggests a capability to understand.
* मुझे समझ आता है (mujhe samajh aata hai): This is a more literary way of saying "I understand."
The best way to say "I understand" in Hindi depends on the specific context and the level of formality required.