Software developers can define complex business algorithms, business processes, government or legal rules or data rules that help keep the data structure consistent with one or more databases. The solutions or rules can be defined on a number of components that reside inside the tier. This tier helps define solutions to complex business problems. In three-tier architecture, the presentation layer is a thin client. The presentation tier is used when the user provides inputs through one or more channels such as traditional applications, websites, portals, mobile device websites and apps. It accepts inputs and sends the inputs or request to the business logic layer. This tier is responsible for accepting inputs or requests from the user and displaying data for the user in a user-friendly format. It is important that the tiers are both backward and forward compatible with all the components of all other tiers. Since the tiers are independent of each other, their operation, maintenance and troubleshooting are also independent. All three tiers in three-tier architecture can be independent of one another in terms of technology, language, logic and platform, and yet need to constantly interact with each other in order to enable the software applications' work.
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