What are WordPress Permalinks?
WordPress Permalinks are the permanent URLs to your individual
Difference Between Permalinks, Slugs, and Links
The permalink is the entire link. The slug is the final part of that permalink.
Media is a post, have comment, author, slug
Disable Media Pages – A plugin to fix many annoyances with WordPress attachment pages. Reddit
As of WordPress 6.4 of October 2023, attachment pages for new WordPress installations are fully disabled. Before this, WordPress created attachment pages by default for every attachment uploaded.