It's a significant and romantic question, expressing the desire to spend the rest of their life with the person they're proposing to.
Here's a breakdown of the words:
* Will: A modal verb expressing a future intention.
* You: The person being asked.
* Marry: To enter into a legal union with another person.
* Me: The person proposing.
It's crucial to note that "merry" is a different word with a meaning of "cheerful" or "joyful". So, "Will you merry me?" doesn't make grammatical sense and isn't used in proposals.