Operational
What is Dependency Injection? When using Dependency Injection (DI) a software component, method or function receives other softwarce components, methods or functions that it requires, as opposed to creating them internally.
Strategic
Hexagonal Architecture (HA) aka Ports and Adapters Pattern, aka Onion Architecture is an architectural design pattern. Why is there need for hexagonal architecture? The motivation for the pattern is * to prevent from dependencies between layers and * to prevent contamination of layer/purpose specific code from other layers/purposes * to improve