A beta tester is an early user who tries a product before its full release, to find bugs and give feedback.
Beta testers often come from a waitlist, the maker's audience or communities and directories that list products in beta.
The most useful ones match the target customer and are willing to say what's confusing.
Why it matters for a launch
Beta testers catch the problems that would otherwise surface in public on launch day, and often become the first customers and testimonials.
Read more: How to build a waitlist