You can deposit a pair of sunglasses in the glove compartment; you can deposit a cupcake into your mouth etc. The most common usage refers to the depositing of money into a bank account though which may seem like a boring subject for a dream, but the meaning may come as some surprise.
If you have a dream about a deposit it just means that you have a lot of financial stability at this point in your life. You don’t so much have to worry about what’s going on around you because you are doing so well financially. This should be great news for you. You have the money to deposit wherever you need to whenever you need to meaning you are flush with cash. Perhaps you are merely balancing your bank account, but even if this were the case then at the very least your dream would mean that you are financially stable which is never a bad thing.
If you have a dream that you have made a deposit at a bank and you are wondering why this dream is happening to you or why you are experiencing these images this is because your mind is trying to tell you that you need to be more frugal. You need to save your money. Take it out of your pockets and put it somewhere where it will be less accessible to you. You do not need to get too concerned with money right now. Just save it up and stop worrying. You need to be more responsible with your cash. This is just the way it goes.
This kind of dream is meant to recall financial matters in general in many cases. It is quite possible that you are dreaming of it because you feel the need to do something about your finances. You need to make a deposit or a withdrawal, pay someone back or take out a loan, etc. The list goes on, but the point is, your mind is on your finances for a reason. It is up to you to figure out what that reason may be.