Three-tier applications are pretty popular and largely used on the web. Almost all simple websites like blogs, news websites, etc., are part of this category.

In a three-tier application, the user interface, business logic, and the database all reside on different machines and, thus, have different tiers. They are physically separated.

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Three-Tier Applications

Let’s take the example of a simple blog. The user interface will be written using HTML, JavaScript, and CSS, the backend application logic will run on a server like Apache and the database will be MySQL. A three-tier architecture works best for simple use cases.

Now, let’s move on to learn about the N-tier applications.