Spring
In plain terms
A comprehensive Java framework for enterprise applications.
Going deeper
Spring provides dependency injection, web, data, and security modules for building large Java systems, with Spring Boot simplifying setup. It dominates Java backends.
Under the hood
DI and convention-over-configuration (Boot) reduce boilerplate; vast ecosystem covers nearly everything.
Examples
Enterprise backends, microservices, REST APIs, Spring Boot apps.
Think of it like...
Like an industrial toolkit with a part for every enterprise job.