They decouple modules: one module publishes an event (“OrderPlaced”) and others react without tight coupling. Pitfalls: deciding sync vs async handling, avoiding doing heavy work inside the same transaction, and ensuring handlers are reliable and idempotent (events can be retried or processed twice).
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "domain-events-inside-a-monolith:-why-use-them-an"
function explain() {
// Start from the core idea:
// They decouple modules: one module publishes an event (“OrderPlaced”) and others react with
}