Can the PS5 Slim play PS4 games? In short, yes. - PC Guide

Backward compatibility is one of the prime things to consider before a console upgrade, so check out if the PS5 Slim can play PS4 games here.
Practical Guides to PC & Tech at Home, Work, and Play

bundle deal drops price of PS5 Slim with Spider-Man 2 this Christmas - PC Guide

PS4 vs. PS5: Everything You Need to Know

The PS5 is supposed to be backward compatible, but it is not reading my PS4 games discs. What could be the issue? - Quora

PlayStation 5 (PS5)

Can you play PS4 games on the PS5?, can you play ps4 games on ps5

PS5 vs PS5 slim Size Comparison : r/playstation

PS5 Guide: Ultimate PlayStation 5 Resource

Will the PS5 Slim be backward compatible? Yes, sort of. - PC Guide

Do we really need a PS5 Pro? : r/playstation