Transfers are point-to-point, meaning that files are exchanged directly from a sender to aa recipient. This type of transfer can only be downloaded once because the file is not saved in the cloud.
Infinit uses an in-house, peer-to-peer protocol that connects a sender and a recipient directly, using the shortest path possible. If the two devices are on the same WiFi network, for example, transfers are much faster than if the two individuals were located across the world. When a file is sent, it is chopped into small chunks on the sender's device. Each chunk is encrypted individually with a key known only to the sender and recipient (more about encryption). The encrypted chunks are then sent to the recipient's device. If the recipient is offline, the transfer is temporarily uploaded to the cloud until the recipient comes online.
Links are much simpler. A link offers direct access to a file, group of files or folders that have been uploaded to the cloud. Links are valid permanently and must be deleted manually in order to be removed. Learn more about links.