Indie Hackers is a meetup where individual "indie hackers" come together to share their experiences, give and receive feedback, and rely on each other for support.
You're an indie hacker if you've set out to make money independently. That means you're generating revenue directly from your customers, not indirectly through an employer. Other than that, there are no requirements!
Indie hackers are often solo founders, software engineers, and bootstrapped, but it's totally okay if you have cofounders, can't code, and have raised money.