Orchestration uses a central coordinator that tells services what to do next. Choreography is decentralized: services react to events and trigger the next step. Orchestration is easier to reason about; choreography reduces central coupling but can be harder to trace.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "saga-orchestration-vs-choreography-—-what’s-the-"
function explain() {
// Start from the core idea:
// Orchestration uses a central coordinator that tells services what to do next. Choreography
}