I've actually spent way too much time digging into this! The MCU does have a bunch of officially licensed novels, though they vary in how closely they tie into the movies. Some are direct novelizations—like 'Avengers: Infinity War'—which add extra scenes or inner monologues you don’t get in the film. Then there are original stories, like 'Captain America: Dark Designs', which feels like a lost episode of the MCU. They’re not essential for continuity, but super fun for deep-cut fans.
What’s cool is how some books expand side characters. 'Black Widow: Forever Red' dives into Natasha’s backstory with original villains, though it’s not strictly canon. There are also junior novelizations for younger readers, like 'Spidey and His Amazing Friends'. If you’re into audiobooks, many are narrated by actors who sound eerily close to the film versions—it’s like getting bonus MCU content for your commute.