At a high level, more specific sources override defaults: command-line args and environment variables typically override `application.yml`, and profile-specific config (e.g., `application-prod.yml`) overrides the base file when that profile is active. Spring resolves properties from multiple places and the higher-precedence one wins.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "spring-boot-config-precedence:-which-sources-typ"
function explain() {
// Start from the core idea:
// At a high level, more specific sources override defaults: command-line args and environmen
}