Is Laravel built on Symfony?

Partly, yes. Laravel uses a number of Symfony components under the hood, including HttpFoundation, HttpKernel, Routing, Console, the EventDispatcher, and others. This means the two frameworks share significant low level lineage and are not as adversarial as comparison articles suggest. Laravel builds its own higher level conventions, ORM (Eloquent), and developer experience on top of solid Symfony foundations. When you write Laravel, you are indirectly relying on battle tested Symfony components for HTTP handling, routing primitives, and console tooling. The Symfony team's work benefits the entire PHP ecosystem, Laravel included.