Share it is an app to send files and folders with any user you're sharing a WiFi connection with. Just select the files you want to share and make them public on that WiFi network. Naturally, you can also send these files directly to other users.
If there's no WiFi network available, you can also use Share it through Bluetooth. The only thing that is required for this is that both users have the Bluetooth option activated on both their devices.
Share it is a really simple file transfer app to send lots of files to other users in a really easy way. You can even share documents found on a PC or a Mac.