The Higgs field is like a big blob of jelly that fills up all of space. Everything we see around us, like people and trees and animals, is made up of very small things called particles. These particles move through the jelly of the Higgs field and some of them stick to the jelly like they have glue on them. This makes them heavier and harder to move around.
Think of it like walking through a swimming pool filled with syrup. Imagine trying to walk fast through the syrup pool, it would be hard work because the syrup would stick to you and make it harder to move.
The more a particle sticks to the Higgs field, the more mass it has. And mass is what makes things heavy and hard to push around. So, the Higgs field is really important because it helps us understand why things have mass and why some particles are heavier than others.