It is used to emphasize something and can be used in many different contexts, depending on the sentence structure. Here are some examples:
* "C'est vraiment un beau jour." - "It's truly a beautiful day."
* "Je suis vraiment fatigué." - "I am really tired."
* "Il a vraiment réussi son examen." - "He truly succeeded on his exam."
* "Vous avez vraiment raison." - "You are indeed right."
You can also use "vraiment" as an exclamation to express surprise or disbelief:
* "Vraiment ?!" - "Really?!"