Plurality voting is like when you and your friends are trying to decide on what flavor of ice cream to get. Everyone gets to pick their favorite flavor, and the one with the most votes wins. So if there are three of you and two vote for chocolate and one votes for strawberry, chocolate would be the winner because it got the most votes.
In bigger groups, you might need more than just two choices for ice cream flavors. That's when you can have more candidates and still use plurality voting. But it still works the same way – the one with the most votes wins, even if they don't have more than 50% of the votes.
Sometimes people think this isn't fair because the winning flavor or candidate isn't the most popular choice overall. For example, if two candidates are very similar and split the votes between them, the other candidate could win even if most people didn't actually vote for them. But that's just how it works with plurality voting.