Badges are awarded to encourage and reward positive community actions within the site.
For more information, see the [badges] wiki on Meta Stack Exchange.
But note that Stack Apps is a little different from other Stack Exchange sites. See:
Hence the badges here are not fully consistent with other sites. For example:
- Stack Apps doesn't have the Beta badge but it does have the API Beta and API Evangelist badges.
- Stack Apps currently doesn't have the Informed badge.