With Earnin, you can access a portion of the money you’ve earned at your job but haven’t been paid for. All ahead of payday, and all through the Earnin app. Earnings is the portion of what you've earned this pay period that you can access before your next payday.
Just keep in mind that your earnings will continue to tick up every day you work, until you reach your pay period max. At that point, your earnings will stop building up until your next pay period starts.