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Can someone provide more detailed explanation about layer?

Courses
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#1

These layers are at the code level. The difference between layers and tiers is that layers represent the conceptual/logical organization of the code, whereas tiers represent the physical separation of components

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Course: https://www.educative.io/collection/6064040858091520/6411938009448448
Lesson: https://www.educative.io/collection/page/6064040858091520/6411938009448448/5110356906082304

#2

Hi, layers represent the logical division of code within the same process. It can be said that similar functionalities are chunked together. On the other hand, tiers are physically separated units in an application with different and independent processes.