All You Need To Know About How Nav Is 3 Tier.

How Dynamics NAV uses a three-tier architecture?

Three tiers are DATABASE , CLIENT and APPLICATION :- 

1. SQL Server is the data tier and is used to store the data into a database.

2. Microsoft Dynamics NAV Server is the middle or server tier, managing all
business logics and communication. It also provides an additional layer of
security between clients and the database, and an additional layer for user
authentication.

3.On the client tier we find the RoleTailored clients, such as the Windows
clients and the Web client. 

Dynamics NAV 2013 also supports other kind of
clients, including Web Services (both SOAP and OData), a SharePoint client
through Microsoft Dynamics NAV Portal Framework, and a NAS service.