IOTA will be hosting an AMA, with BOSCH, over on the /r/iota subreddit on the 25th of January.

The main subject of the AMA will be XDK and Tangle related questions.

Original thread

IOTA is a free transfer cryptocurrency which uses the Tangle mechanism in order to allow for free transactions, as well as making transactions faster the more users are doing transactions.

Since you have to confirm two previous transactions in order to have your transactions listed, it means that you contribute to the network, thus eliminating this cost. IOTA can be compared to its biggest competitor, RaiBlocks, who save very similar goals.

IOTA Website

IOTA Whitepaper