Glossary term
What is Pre-signed URL? Meaning for developers
A temporary, signed link to upload/download one file. Example: Browser uploads a photo directly to S3.
Learn it properly · System DesignLesson 17: Object Storage: How S3-Style Storage WorksImages saved to a server's disk vanish when you add a second server. How S3-style object storage keeps files safe at any scale, why uploads should skip your servers entirely, and what belongs in the database instead.