Hey Janny, I can see why is there a confusion as there are plenty of video conferencing apps out there. We can’t really pinpoint as to which one is the best but I can definitely suggest a few of them which are good enough to be included here.
Skype which is already too popular to be put up here, we have a good option of Google Hangouts, for free Gmail and G Suite basic customers, Google Hangouts allows for up to 10 people to chat in a video call.
There’s WebEx which can host up to 100 participants in a single call, for as long as you want. You can also checkout FreeConference and Jitsi.