I've been out of the DM game since the early 80s, now coming back to 5e (which I love). I'm reading up like mad, but my mind mixes up versions of the game.
I remember each team (PCs vs enemy NPCs) taking turns attacking. And on each side, initiative would be rolled to determine pecking order. Does rolling initiative still work this way? Does it ever scramble up turns so that a PC attacks, and then a NPC enemy, and then back to the adventurer's team--until the round is up, and begins again?