What are other examples of Server apart from Apache?

[_arwa]

In the 3 tier examples, the backend server example was Apache? is Nodejs server also considered backend server

[Danila]

For example:

• LAMP it is Classic Tier)) Linux, Apache, MySQL, PHP
• C#, Microsoft IIS (server) + Microsoft SQL Server
• Golang (Server) + PostgreSQL
• Python (Server) uWSGI + MongoDB