Battle Pass is a periodic event where Hunters and Huntresses have to reach consecutive goals.
During the event, there are two types of tasks available: Daily and Seasonal.

Each of them is worth a certain number of tokens, which will be later used to open further thresholds. On the progress bar, you can see your current position and how many points you need to unlock a new threshold.
Above the task lists, you can see how much time is left before the tasks are reset. Every player gets the free pass by default, but if you want to have access to more exclusive rewards, you can purchase the Golden Ticket.