A propriety application for instand communications on eletroic devices such as smart phones ,tablet computers and personal computer.line users had many thing we can do.exchange texts,images,video and audio,and conduct free VoIP conversations.and video conferences line,designed in korea and launched in japan in 2011,reached 100million users within eighteen months and 200 million users only six months later.line became japan's larget social network in 2013.in october 2014,line announced that it had attracted 560 milllion users worldwide with 170 million active users accounts.in february 2015,it announed the 600 M mark had been passed and 700 M were expected by the end of the year