Handshake is a handy app that makes adding new people to your contacts list a breeze. Whether you’re at an important business event, or simply run into someone on the subway, Handshake allows you to add their details quickly and easily. Better than that? Your contacts list updates each time one of your network edits their information. No more business cards that use up paper and contain outdated information. Handshake lets you keep all your important info in one place.