These are collectible magazines which replaces "skill books" used in the earlier releases of the game. Once collected, these magazines provide new perks. Reading issues in the same series increase the perk's rank, further increasing its effectiveness.

While most of the magazines provide additional effects and bonuses, some of these magazines can unlock additional crating options, paintjob for your Power armor, mini-games that can be played in any terminal or in your Pipboy (you can play these in your mobile device if you connect your game with the partner mobile app), and many more.

There are a total of 120 magazines that you can collect. So far, only one seems to be missable because of glitch where the character that's supposed to Lead you to the locked basement won't exist, locking you out from the location without the option to pick the lock.
Like bobbleheads, you can store your magazines in magazine racks. Since each rack can hold 20 issues, you'll need 6 racks display all magazines you collect.
