Why is my car making a loud BOOM noise when putting it in Drive from Park?

Why is my car making a loud BOOM noise when putting it in Drive from Park?
Added (1). I have a 1998 Honda Accord. From one day to the next i got in my car in the morning to go to work, turned it on, put the car in D4 from park, let go of the brake, and heard a loud "BOOM". Can someone please tell me why this is? When i drive, it takes a little long to get out of first gear and when it does change gears, my RPMS sky rocket to around 5 or 6 and i get a BOOM. I have limited knowledge on cars, you are talking to a dummy.

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