You would use "realize" when you suddenly become aware of something, such as "I just realized I left my wallet at home." You would use "understand" when you have a more comprehensive grasp of a concept or situation, such as "I understand the importance of saving for retirement."
While "realize" and "understand" are related, they are not always interchangeable. "Realize" is more specific to a sudden or new awareness, while "understand" is broader and implies a deeper, more complete comprehension. Using the wrong term can change the meaning or nuance of what you're trying to convey.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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