Bumble is a dating app. What makes bumble different is that the women have the power, initially. This means the women have to send the first message if they match. So, if a man swipes right on a woman and she also swiped right. You are both notified of the match, and she has 24 hours to send the man a message. If no correspondence is sent, you both get thrown back into the pile, and you could match again at some point.