# General

- [General Concepts](/v3/general/general-concepts.md): This general concepts overview includes definitions and guidelines so you can fully take advantage of the Elements suite of APIs.
- [N-Tier Architecture](/v3/general/n-tier-architecture.md): Elements uses the N-Tier Architecture style with three layers, including the Presentation Layer, Service Layer, and DAO Layer.
- [Security Model](/v3/general/security-model.md): Elements offers a proven security model with three levels of access for users. Take advantage of SSO with Facebook and Apple accounts, or native account login - all with profile management.