Hello there! Do you like superheroes? Scalar bosons are like superheroes that help explain why particles have mass. You know how everything in this world has weight? Even your favorite toy or your pet cat has it, right? This weight is actually called mass. Scientists have been trying to understand why particles have mass since forever, and scalar bosons have helped them find some answers.
Now, imagine a group of tiny particles in a party. You know how you can push some objects, like a ball, easily, but others, like a big rock, are hard to move? The same thing happens with these particles too. Some particles are "heavier" than others, which means they are harder to push around. And scalar bosons are like messengers who carry a message that tells other particles how much they should be "weighing" or how heavy they should be!
Scientists used to think that particles got their mass from something called the Higgs field or Higgs boson. But scalar bosons are a different type of boson that can also help explain mass. They are like the messenger that carries the message about how much mass a particle should have. It's like a tiny superhero that helps the world of particles make sense!
So, in short, scalar bosons are messengers that help particles have mass, just like some superheroes help people solve problems. They are very important in the world of physics because they help us understand why things have the weight they do.