An early adopter is someone who tries new products before most people do, accepting missing features and bugs in exchange for solving a problem sooner.
Early adopters usually have the problem badly enough that they were already patching together a solution. That is what makes them tolerant, and what makes their feedback specific.
They gather where new things are posted: launch platforms, niche communities, and the replies under posts about the problem.
Why it matters for a launch
Your first users will almost all be early adopters. Go to where they already look for new tools instead of trying to reach everyone at once.
Read more: How to get your first users