Managing a large group of testers makes it easier and faster to conduct user testing as you go.
A test panel is a group of testers, who opts in for testing your ideas and designs. These are REAL people, who you can rely on for testing again and again. This means you don't have to recruit testers everytime you need to conduct a test.
You can invite people to sign up for your own test panel. No limit. You have full control. You can delete one or more at a time. You can group them using labels.
Use labels to group testers
Use segmentation in your test panel when sharing tests.