The phrase "I understand" in English can be used to convey that you comprehend or grasp the meaning of something. It is a simple and direct way to express your comprehension, and it can be used in various contexts. For example, if someone explains a concept to you, and you realize what they are saying, you can respond with "I understand." Similarly, if you watch a movie or read a book and have a newfound insight into its themes or messages, you can say "I understand now." The phrase is versatile and can be used in both formal and informal situations to indicate that you have grasped the essence of something.
