Low Orbit Ion Cannon is a Denial of Service (DoS) application which has been released into the public domain and 2012 has brought an alarming increase in the number of application downloads.
The idea behind LOIC is that it can allow you to participate in DoS attacks even if you’ve no clue how to really use a computer. DoS attacks are launched with the intention of attempting to make a computer or network unavailable to its intended users and the usual targets are high profile web-servers such as banks.