As we say architecture, Salesforce designed to be in many layers that uphold various services like CRM, app development, and Data-Security. There are many occurrences where we see various sorts of layers notice in the articles. In this way, here I accompanied every one of the necessary fundamentals clarification for these layers on minute level.

Salesforce architecture have different layers with their own purpose of functionalities like:
- Multi-Tenant Architecture
- Sharing same platform with different customers without compromising privacy & security.
- Metadata-Driven Architecture
- It shows the way how Configurations and customizations inside Salesforce stage ought to done.
- APIs
- It is the communication link between the Salesforce platform and external system.
- Application (SaaS)
- Salesforce applications provided as Sales Cloud, Service Cloud, Marketing Cloud, Health Cloud etc are ready to use CRM functionalities which supports diverse individual business activities.
- Platform (PaaS)
- Force.com is a salesforce platform which has all the foundational functions along with abilities to build custom application as it equip with declarative as well as programmatic development.
- Salesforce Infrastructure (IaaS)
- Salesforce has their foundation around the world over the cloud as conventional salesforce cloud or Hyper-force (Worldwide Framework) which assists with accomplishing openness, accessibility, and recuperation from debacles.
- Database
- Here, Data is store in Object as it consider as Table which are of two types Standard and Custom. Data is secure with redeeming feature like data encryption and Sharing rules.
- Security
- Many security features are available there like Authentication (2FA, S-S-O), Authorization ( roles, profiles, permission sets), Field-Level Security, Object-Level Security, Organization-Wide Defaults (OWD), Data encryption etc.

These layers can be mainly categories into two different types and each types have three prominent layers——>
CATEGORY 1 | CATEGORY 2 |
Multi-Tenant Metadata APIs | Salesforce Platform Salesforce Product APIs |
Conclusion : Salesforce architecture is a robust, multi-facet framework intended to convey versatility, adaptability, and security for business, everything being equal. Every one of these work together to run the entire CRM framework for the clients as they need foundation where they can utilize the items and interface them with other outer frameworks to make their business worldwide acknowledgment.