Instant messenger with high quality audio and video backend. Skype is one of the most popular multimedia messengers and often is used for video conferences because it has a high quality of video transmission and no sound delay.
Some features includes call mobile phones with low prices, call other Skype users for free, call groups with many people; make a video conference and all people can view live images, send video and text (SMS) messages and send or receive files.
Also, you can share computer screen or view screens of people invited in a group.