Neuroticism is a big word that describes how easily someone gets upset or worried about things. It's like having a big, wobbly glass jar inside your head with lots of different feelings in it. Some people have a big, wobbly jar and get upset or worried very easily. Other people have a smaller, more stable jar and don't get upset or worried as much.
People who are high in neuroticism feel anxious, sad, and moody more often than others. Little things can make them worry or upset much more than other people. It's like when you spill a little bit of juice on your shirt and feel like it's the end of the world.
People who are low in neuroticism are more calm and relaxed. They don't worry as much about little things, and they are less likely to get upset over small problems. It's like when you spill some juice on your shirt and just shrug it off and keep playing.
Some studies suggest that neuroticism might be partly caused by genes, which are like little instructions that are passed down from our parents. Other studies suggest that life experiences, like bad things that happen or happy things that happen, can also affect how high or low someone is in neuroticism.
It's important to remember that being high or low in neuroticism doesn't make someone good or bad, right or wrong. Just like how some people like apples and some people don't, some people are naturally more neurotic and some people aren't. What matters most is how people deal with their feelings and how they treat others, no matter what kind of jar they have in their head.