What are the different Flow Builder types and when would you use each?

Screen Flow: Presents a UI to the user — a guided multi-step wizard. Launched from Lightning pages, quick actions, community pages, or embedded in a VF page. Used for complex data entry, guided processes, and step-by-step wizards.
Record-Triggered Flow: Automatically fires when a record is created, updated, or deleted. Before-save flows run in the same transaction as the DML (fast, no separate transaction); after-save flows run after the record is committed. Replaces most workflow rules and Process Builder use cases.
Scheduled Flow: Runs at a specified time and frequency on a batch of records matching filter criteria. Used for nightly/weekly batch operations (send reminder emails, update fields on old records).
Platform Event-Triggered Flow: Fires when a specific Platform Event message is received. Near-real-time event processing with decoupled architecture.
Auto-Launched Flow (no trigger): Called programmatically from Apex, another flow, a process, or an API. No UI, no automatic trigger — used as a reusable sub-flow or invoked from code.