Example of 4-Tier (for N-Tier) Architecture?

Question

Recently a friend of mine asked me about N-Tier architectures and I was able to explain to him about 1, 2 and 3 tier architectures with examples. But I was stuck when I wanted t

Answer 1

Five minutes ago I've read an article of this https://www.nginx.com/blog/time-to-move-to-a-four-tier-application-architecture

Client is where you read it Api or your application back-end is where you assemble it .. Data aggregation.. Either goes through the jsons/xmls from outsourced things or queries on your database and lastly service tier is where you actually do the query on database or run function on big data or read GPS locations and maps from google ... That is how I see it in this case. It simply divided the data layer from three tier.

But this N-tier model is totally abstract so you can tear your infrastructure until you have some logically atomic parts only. Still dividing the previous structure.