USENET was popular and used before the World Wide Web and internet browsers were easily accessible to the general public and remains the oldest internet communication tool that is still in use today.
USENET is a forerunner to many aspects of the modern internet. Users could search USENET for topics of interest and engage in conversation over a wide array of content areas.
Yes, but not anyone near its heyday of the late 1990s/early 2000s. Users can still access USENET servers, participate in forums, download content, and find providers that will allow them to use USENET.