# Application

Learn the key concepts about application setup.

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Use the summary below to quickly jump to a specific topic:

- [Application](/explanation/application/overview): Learn more about applications.
- [Sessions](/explanation/application/sessions): Understand how events are grouped into visits.
- [Anonymity scope](/explanation/application/anonymity-scope): Control how your application recognizes anonymous users across sessions and applications.
- [API key](/explanation/application/api-keys): Learn more about API keys and how to generate them.
- [Signed token](/explanation/application/signed-tokens): Learn how to secure your application with signed tokens.
- [Trusted origin](/explanation/application/trusted-origins): Learn how to manage your application's trusted origins.