What does $_ mean in PowerShell?

Related questions

1. What is artifact staging directory?
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3. Does control group have dependent variable?
4. Which variables are measured?
5. What is a outcome variable?
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7. What are some controlled variables?
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2. #variable
3. #instead
4. #often
5. #powershell
6. #whose
7. #together
8. #command
9. #pipeline
10. #shows
11. #equal
12. #dllhost
13. #referred
14. #indicates
15. #joined
16. #ordinary
17. #however
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19. #commands
20. #refers
21. #processes