Skype is a
o crowdfunding app
o voice over ip service
o social network
o wi-fi hotspot

Skype is a Voice over IP service

Explanation:

Skype is a software which works online and provide users various features like, chat, make calls using internet and calls can be made to any people in the world which costs lesser than an ISD. We can even have audio and video call.

The quality of the audio and video call depends on the bandwidth, network supply in the area, etc. The advantage is that it is available “free of cost”. Apart from chat and calls, we can even “send files” to the connected people.

answer; availability;