Whilst both is definitely the correct answer, in all honesty it depends on the therapist. Some of them seem like they couldn't care less of a shit and scarcely will talk to you at all, making them more for venting. Some and from my experience most will try to offer advice and problem solve, and should you exceed over like 20 sessions with no signs of progress they might choose to discontinue/abandon.
Again tho, it honestly depends on the therapist themselves. You can always ask for them to take a more existentialist or humanistic approach to your sessions if you feel like your more there for venting.
As with all shit that involves professionals, trend lightly around your words. Unless you wanna be involuntarily hospitalized, make sure they don't perceive you being in immediate danger.