Is PlayStation Network (PSN) free?

It is important to highlight the distinction between the PSN and PS Plus since one of them is a free service while the other requires a paid subscription.

PlayStation Plus review: Premium, Extra and Essential

PS Plus/PS Now Card Conversion Rates (All Countries, so far) : r/PlayStationPlus

Buy PlayStation Plus subscription, PS Plus cheap

November PlayStation Plus free games: Mafia II, DRAGON BALL, and Aliens Fireteam

Existing PS Plus & PS Now subscribers get free PS Plus Premium upgrade

PS Plus adds 2021's Game of the Year, but loses Stray

PlayStation Plus October FREE games: The Callisto Protocol, Weird West, and more

PlayStation Plus Extra: 20 games to try if you don't know what to play

PlayStation®Plus Hundreds of games to download and play, PlayStation classics, game trials and more