Final answer:
Sitecore publishes items from the master database to the web database, which is the public-facing database that end-users access when visiting a Sitecore website.
Step-by-step explanation:
Sitecore publishes items from the master database to the web database. This process is a critical aspect of Sitecore's content delivery mechanism. When content is created or updated in the master database, a Sitecore administrator or automated publishing task can push these changes to the web database, which is the database that end-users interact with when they visit a Sitecore-powered website.