Software overengineering happens when an implementation introduces more layers, components, configuration, or extensibility than the current problem requires. The extra structure may look sophisticated while making the code harder to understand and change.
Avoiding overengineering does not mean removing validation, security, accessibility, or error handling. It means choosing the smallest design that satisfies the requirement and its safeguards, then adding complexity only when concrete needs justify it.
ELI5
Software overengineering adds more layers, dependencies, configuration, or flexibility than the current requirement needs. The design may look sophisticated but become harder to understand, test, and change.
For example, a small fixed calculation may not need a plugin framework and several services. Choosing a simpler design does not mean skipping security or error handling; it means adding complexity only when a concrete need justifies it.
