A recall is like a big ol' warning sign that says, "Hey, we've found a problem with your car, and we want to fix it for you!" It's usually issued by the manufacturer or the government when they discover a safety issue or a defect that could put you or others at risk. For example, the 2017 Honda Accord recall was issued due to a problem with the fuel pump that could cause the engine to stall or not start at all.
Now, you might be thinking, "But I've been driving my Accord for years, and nothing's happened so far!" And that's great - but it's like playing a game of roulette, where you might get lucky, but you might also end up with a big problem on your hands. By ignoring a recall notice, you're essentially gambling with your safety and the safety of others on the road.
