Skype is the oldest of the video conferencing products at this level. It has been around since 2003 and I subscribed very early on to use it to speak to family who were travelling abroad.
Skype is very easy to use once you have an account although recently (2020), Skype introduced a new way of connecting with people to compete with Zoom and Teams, called Meet Now. This allows you to connect instantly by inviting people through a link, email address (inclusing Ourlook Mail and Gmail) or Facebook.
The video and sound quality is as good as any and of course it is owned by Microsoft.
