Gifts-giving is typically a sign of two things.
It is either a sign of a transaction or a sign of a relationship. Sometimes, a gift given can also be a sign of both.
What we should never assume of a gift is the intent behind it. It could be a trade for something else, albeit intangible, like a good feeling, or a show of pure love with zero expectations of getting anything in return. If you are patient enough the real intent behind gifts always shows up.