Okay, so you know how sometimes you might think that everyone around you thinks and agrees with the same stuff as you do? You might think that because that's what you believe, other people must think like that too. Well, that's called "false consensus".
Let's say you really love the color yellow. You think it's the best color in the world and you're sure that everyone else must feel the same way. But the truth is, not everyone likes yellow. Some people might prefer blue, green, or pink!
The same thing can happen when we talk about bigger things like politics, religion, or social issues. You might think that everyone believes the same thing you do, but the reality is that people have different opinions and beliefs.
False consensus happens when we assume that what we believe is what everyone else thinks and feels too. But that's not always true! It's important to remember that people are different and have their own thoughts and ideas.