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MVC design pattern separates Models, Views, and Controllers

Routing system maps URLs to controllers and actions

Helpers and libraries provide reusable functionality

Configuration files define environment settings and autoloaded components

Core system handles request processing and security features

Controller -> Model -> View -> Response to client

Helpers and libraries augment controllers and models

Routing maps URLs to controllers

Views handle presentation logic

Optional template engines can be integrated

MVC pattern

Modular grouping of controllers, models, and views

RESTful API structure

Routing-based request handling

Config-driven application setup

CMS platforms for small businesses

Internal HR/CRM dashboards

RESTful APIs for mobile apps

E-commerce websites for small to medium vendors

Rapid prototyping of SaaS applications

Lightweight and fast

Minimal configuration and convention over configuration

MVC separation of concerns

Ease of use and simplicity

Security and performance optimized

Use database indexing for large datasets

Leverage caching for high-traffic apps

Implement load balancing and multiple server instances

Modularize code to maintainability

Optimize queries and minimize memory usage

Upgrade from CI3 to CI4 involves refactoring namespaces

Update routing and autoload configuration

Replace deprecated libraries and helpers

Test models and controllers in new environment

Review third-party library compatibility