Skype is an application that provides video chat and voice call services. Users may exchange such digital documents as images, text, video and any others, and may transmit both text and video messages. Skype allows the creation of video conference calls. It can be used both on computer or smartphones. Skype can be used to call phone numbers.
Google Hangouts is a communication platform developed by Google which includes instant messaging, video chat, SMS and VOIP features. Google has also stated that Hangouts is designed to be "the future" of its telephony product, Google Voice, and integrated some of the capabilities of Google Voice into Hangouts. In current versions of Android, Hangouts is the default application for text messaging.